10w30 vs 5w30 Lawn Mower Oil: Which One Should You Buy?

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10w30 vs 5w30 lawn mower oil: what the listings show

Oil	Grade	Size	Stated fit or protection
Valvoline MaxLife 5W-30	5W-30 synthetic blend	5 Quart	Engines with 75,000 miles or more
Valvoline Advanced 5W-30	5W-30 full synthetic	1 QT	Engines with less than 75,000 miles
Mobil 1 Advanced 5W-30	5W-30 full synthetic	5 Quart	Title states 10,000-mile protection; bullets state 15,000 miles
Mobil 1 Extended Performance 5W-30	5W-30 full synthetic	5 Quart	Title states 20,000-mile protection; bullets state 25,000 miles

Each listing states SAE J300 Viscosity Grade 5W-30. The Valvoline listings also list 10W-30 among their grades available, alongside 5W-20, 10W-40 and 20W-50 for MaxLife, and 0W-16, 0W-20, 10W-30, 20W-50 and 5W-20 for Advanced. That is the only place 10W-30 appears in the listings: as an available grade, not as a listed product. A reader looking for a bottle graded 10W-30 will not find one among the listings in this guide.

The listings also differ in what they claim beyond grade. Valvoline MaxLife states seal conditioners to help prevent oil leaks and reduce oil consumption, with 20% better wear protection and 15% better sludge defense than industry standards, as the listing states. Valvoline Advanced states 40% stronger wear protection, 15% better deposit defense and up to 2.5X better heat protection than industry standards, as the listing states, plus excellent low-temperature flow for cold starts. Those figures are maker claims, reported here as stated, not as a comparison this guide measured.

Read the grade on the bottle, not the brand

Brand alone does not settle the grade, because Valvoline and Mobil each list a 5W-30 product here, and the Valvoline listings also list other grades as available. Check the SAE J300 Viscosity Grade line on the listing for the bottle being bought, and check the size: Valvoline Advanced is listed as 1 QT with 32 fluid ounces, while the other listings are listed as 5 Quart with 160 fluid ounces. Size matters for how many bottles a change needs, and the listings state size plainly, so there is no need to guess.

Weight is stated for most listings and not for all: Valvoline MaxLife lists 9.5 pounds, Valvoline Advanced lists 1.8 pounds, and Mobil 1 Extended Performance lists 10.1 pounds, while weight is not stated for the Mobil 1 Advanced listing. Flash point is stated as 394 °F for both Valvoline listings, and as 230 °C for the Mobil 1 Advanced listing, with no flash point stated for the Mobil 1 Extended Performance listing. Where a figure is not stated, this guide says so, rather than borrowing a figure from another listing.

Mileage fit: less than 75,000 miles or more

The clearest split among the Valvoline listings is engine age, not brand. Valvoline MaxLife is formulated for engines with 75,000 miles or more, with seal conditioners and extra detergents against friction, corrosion and deposits, as the listing states. Valvoline Advanced lists mileage of less than 75,000 miles, with protection against wear, friction, heat and deposits, as the listing states. A reader with an aging engine and a reader with a newer engine are therefore looking at different Valvoline listings, even though both are graded 5W-30.

The Mobil listings do not state an engine-age fit. They state protection miles instead: 10,000-mile protection in the title line and 15,000 miles in the bullets for Mobil 1 Advanced, and 20,000-mile protection in the title line and 25,000 miles in the bullets for Mobil 1 Extended Performance. Protection miles and engine age are different figures, and this guide keeps them separate. Do not read a protection figure as an engine-age fit, and do not read an engine-age fit as a protection figure.

The gear: 5W-30 oils in the listings, in ranked order

The listings below are ranked by the strength and breadth of the claims each listing states, from the fullest stated claim set to the narrowest fit. The ranking is not a mower manual grade, and it does not make a 10W-30 bottle appear where none is listed.

Valvoline Advanced Full Synthetic SAE 5W-30 Motor Oil, 1 QT. A full synthetic 5W-30 with 40% stronger wear protection, 15% better deposit defense and up to 2.5X better heat protection than industry standards, as the listing states, plus excellent low-temperature flow for cold starts. It meets ILSAC GF-7A, API SQ, API SP and API SN with SN PLUS, as the listing states, and lists mileage of less than 75,000 miles. It fits a reader who wants a full synthetic 5W-30 in a smaller bottle for a newer engine. It does not fit a reader who wants a 5 Quart bottle, since this listing is 1 QT.

Mobil 1 Extended Performance Full Synthetic Motor Oil 5W-30, 5 Quart. A full synthetic 5W-30 with a triple action formula and extreme temp control, as the listing states. Its title line states 20,000-mile protection while its bullets state protection for 25,000 miles, and this guide reports both figures as listed, without choosing between them. It fits a reader who wants a 5 Quart full synthetic 5W-30 with the largest stated protection figures in this guide. It does not fit a reader who wants a stated engine-age fit, since this listing states none.

Mobil 1 Advanced Full Synthetic Motor Oil 5W-30, 5 Quart. A full synthetic 5W-30 with a triple action formula and friction reduction, as the listing states, with additives to help fight sludge. Its title line states 10,000-mile protection while its bullets state protection for 15,000 miles, and this guide reports both figures as listed, without choosing between them. It fits a reader who wants a 5 Quart full synthetic 5W-30 for a car, as the listing states compatibility with a car. It does not fit a reader who wants a stated weight, since weight is not stated for this listing.

Valvoline MaxLife High Mileage 5W-30 Synthetic Blend Motor Oil, 5 Quart. A synthetic blend 5W-30 formulated for engines with 75,000 miles or more, with seal conditioners to help prevent oil leaks and reduce oil consumption, as the listing states. It states 20% better wear protection and 15% better sludge defense than industry standards, as the listing states, and meets ILSAC GF-7A, API SQ, API SP and API SN with SN PLUS, as the listing states. It fits a reader with an aging engine best, and it is ranked here for its narrower fit, not for weakness: for an engine with 75,000 miles or more, it is the listing in this guide that names that fit.

Check size, weight and warranty wording

Before choosing, check size, weight and warranty wording on the listing for the exact bottle. Size is 1 QT for Valvoline Advanced and 5 Quart for the other listings, with 32 fluid ounces and 160 fluid ounces respectively, as the listings state. Weight is stated for the listings named above, and not stated for Mobil 1 Advanced. Warranty wording is limited: the Mobil listings state a limited warranty and say to contact the manufacturer for full details, with no term stated, and the Valvoline listings state no warranty term. A warranty with no stated term is not scored as a term in this guide.

Safety

Wear gloves and eye protection when handling oil, and keep children and pets away from the work area. Service the engine only when it is off and cool, and follow the manual for the mower being serviced. Store oil away from heat and open flame, and keep the bottle closed when not in use.

FAQ: mowing large lots

Can a mower use 5W-30 oil?

Each listing in this guide is graded 5W-30, and the Valvoline listings also list 10W-30 as an available grade. Check the grade your mower lists before choosing, since this guide reports the listings, not a grade for a particular mower.

What is the difference between 10W-30 and 5W-30 in these listings?

In these listings, 10W-30 appears only in the grades-available lists for the Valvoline products, while every listed product itself is graded 5W-30. The listings do not state a viscosity comparison, so this guide does not rate one grade over the other.

Which oil fits a high-mileage engine?

Valvoline MaxLife is formulated for engines with 75,000 miles or more, with seal conditioners, as its listing states. Valvoline Advanced lists mileage of less than 75,000 miles, so the two Valvoline listings split on engine age.

Why do the Mobil listings show different mileage figures?

The Mobil 1 Advanced title line states 10,000-mile protection while its bullets state protection for 15,000 miles, and the Extended Performance title line states 20,000-mile protection while its bullets state 25,000 miles. This guide reports both figures as listed, without choosing between them.

Does any listed oil state a warranty term?

The Mobil listings state a limited warranty and say to contact the manufacturer for full details, with no term stated. The Valvoline listings state no warranty term.

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