Mercury Marine, the manufacturer of the 4.3L MerCruiser engine, specifies that the owner uses Mercury MerCruiser Full-Synthetic Engine Oil, 20W-40, with an NMMC EC-W rating.
This specific oil is recommended by the company for all MerCruiser engines, including the 4.3L. It is available at many marine service/parts centers.
FAQ 2003 Mercruiser 4.3 oil type synthetic or blend
What kind of oil do you put in a MerCruiser?
Recommended Oil. Mercury Marine, the manufacturer of the 4.3L MerCruiser engine, specifies that the owner uses Mercury MerCruiser Full-Synthetic Engine Oil, 20W-40, with an NMMC EC-W rating. This specific oil is recommended by the company for all MerCruiser engines, including the 4.3L.
What lubricants are not covered by the Mercury MerCruiser warranty?
Catalysts damaged by lubricants containing high levels of phosphorus may not be covered by the MerCruiser Limited Warranty. If Mercury MerCruiser Full-Synthetic, 20W-40 oils is unavailable, use the following lubricants, listed in order of recommendation.
Is SYN3 oil a synthetic oil?
But in reality, SYN3 is more of a semi-synthetic. IMHO Harley Davidson ought to be more forthcoming about that fact rather than giving customers the false impression that SYN3 is a 100% synthetic lubricant which it CLEARLY is not. If you want a fully synthetic oil, Mobil-1, RedLine or Amsoil might be better choices.
What kind of oil do you put in a Ford truck?
Synthetic oil is compatible with conventional oil and synthetic blends. Ford’s own Motorcraft brand is a synthetic blend.
It’s what came new in your truck (2003 model year and later), but they aren’t the only ones that will work. Typical blends have no more than 30% synthetic oil mixed with the standard base.
Fleets have three options of oil type: conventional, synthetic, or synthetic blend
Is Synthetic Motor Oil Bad For Old Cars?
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