It is a large engine, adequate for water-sports towing, and is generally used in larger runabouts and cruisers. Using the proper oil in the MerCruiser 454 engine will aid its longevity. Some marine-grade oils contain high phosphorus levels, which can damage the 454’s catalyst system. Use of those oils on the 454 can void the warranty.
FAQ 454 oil type
What kind of oil should I use in my 454 engine?
Neither does the company recommend multi-viscosity oils (other than 25W-40 or 20W-40), or synthetic oils without the FC-W rating. Non-recommended oils do not provide the 454 same level of protection or engine performance.
What kind of engine does a MerCruiser 454 have?
It is a large engine, adequate for water-sports towing, and is generally used in larger runabouts and cruisers. Using the proper oil in the MerCruiser 454 engine will aid its longevity.
How bad is synthetic oil for a 1970s car?
The seal technology in the 1970’s and 1980’s is not very good at handling synthetic oil. You have a high chance of getting leaks based on the cleaning of syn oil over time. Engine sealing technology changed radically in the 1990-1994 time frame.
What type of oil to use for Breakin?
Syn oil should be ok for breakin of roller setup,its the flat tappet setups that can have issues with fully syn for breakin and mfg rec against syn oil for flat tappet breakin too. Click to expand… GMPP expressly states to use regular oil not syn oil for the engine breakin on their 454HO.
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At SM CAR CARE, we are dedicated to providing top-quality maintenance and repair services for vehicles of all types. As part of our commitment to keeping our customers informed, we have created a blog that focuses on engine oil types and capacities for different vehicles. Our team of experienced mechanics has a deep understanding of the importance of choosing the right engine oil for a car, knowing the correct oil capacity for each vehicle, and understanding the impact that oil type can have on engine performance.
We created this blog to share our expertise with vehicle owners who want to keep their cars running smoothly and efficiently. Our blog covers a range of topics related to engine oil, including the engine oil capacity for various cars, the importance of using the right oil type, and the impact that engine oil prices can have on overall vehicle health.