Is Mobil 1 Full Synthetic worth it over a cheaper synthetic?

It meets ILSAC GF-7 and carries a long track record with OEMs and mechanics. Cheaper synthetics can meet the same standard, so the premium buys brand trust and a long drain interval more than a unique spec.

How often should I change it?

Mobil rates it for up to 15,000 miles or one year, whichever comes first. Short trips, towing, dust and extreme heat count as severe service, and most owners should follow their owner's manual interval instead.

Does it meet my car's warranty requirements?

It meets ILSAC GF-7 and is a 5W-30 oil, which covers many modern gasoline engines. Check your owner's manual for the required viscosity and any OEM-specific approval before buying.

Is this the same as Mobil 1 Advanced Full Synthetic?

This is the core Mobil 1 full synthetic 5W-30. Mobil's extended-performance and high-mileage lines are separate products with different claims, so match the bottle to your engine's needs.

How much oil does the bottle hold?

One bottle holds 5 quarts (160 fl oz), enough for most four-cylinder and V6 passenger cars. V8s and some larger engines need more than one bottle.

Can I mix it with another oil?

Mixing with another 5W-30 synthetic is generally acceptable for topping up. For a full change, use one product so the drain interval and spec claims still hold.

Where is the Mobil Full Synthetic Motor Oil cheapest?

At Walmart, for $31.97, 20% under what the other stores charge, as of our latest check.

Where can I buy the Mobil Full Synthetic Motor Oil?

5 stores we checked sell it, including Amazon, Walmart, Tractor Supply Company, eBay, BakesOnline.com.

Mobil Full Synthetic Motor Oil Price History: $31.97 at Walmart

What reviewers say

Owners and mechanics widely trust Mobil 1 as a proven full synthetic, citing clean engines and steady oil pressure over long intervals. Criticism centers on cost and on the 15,000-mile claim being unrealistic for short-trip or heavy-duty driving.

What people mention

Engine cleanlinessPraisedOwners report clean valve covers and little sludge after long use.
PriceCriticisedBuyers say it costs more than rival full synthetics with similar ratings.
Drain intervalMixedSome trust the 15,000-mile claim; others shorten it for short trips or towing.
Cold startsPraisedDrivers note easier starts and quicker flow in cold weather.
Oil consumptionCriticisedA few owners of older engines report needing to top up between changes.

From BakesOnline.com

Mobil 1 full synthetic formula for reliable engine lubrication and protection
SAE 5W-30 viscosity for compatible engines specifying this grade
Helps reduce friction and protect critical engine components
Thermal stability resists oil breakdown at elevated operating temperatures
Deposit control helps reduce sludge and deposits
Oxidation resistance helps maintain oil performance through the service interval

Sizes: 5 Quart
Sizing: Applicable Malibu Monsoon M5 and M6 engines hold about 8 quarts with a filter change, so one 5-quart bottle is not enough for a full change; some M6Di engines (
Shipping: Free shipping on most USA orders over a stated threshold.
In the box: One 5-quart (160 fl oz) bottle of Mobil 1 Full Synthetic 5W-30 engine oil

About the Mobil Full Synthetic Motor Oil

Mobil 1 Full Synthetic 5W-30 is a motor oil made with Mobil's Triple Action Formula. It is designed to lubricate and protect engines, and to keep them clean. Specialty components reduce the friction that causes deposits and sludge buildup.

The oil resists breakdown at high operating temperatures and resists oxidation through the service interval. It meets ILSAC GF-7 standards, including protection against pre-ignition and timing chain wear and performance in cold starts and low temperatures. It protects for up to 15,000 miles or 1 year, whichever comes first.

It suits engines that specify SAE 5W-30. The bottle holds 5 quarts. Some engines need more for a full oil and filter change: Malibu Monsoon M5 and M6 engines hold about 8 quarts, so one bottle is not enough for them.

Type: Full synthetic motor oil
Viscosity: SAE 5W-30
Volume: 1.25 gal (5 quarts, 160 fl oz)
Standard: ILSAC GF-7
Change interval: Up to 15,000 miles or 1 year, whichever comes first
In the box: One 5-quart (160 fl oz) bottle