The myth of synthitic oil...
06-19-2004, 01:39 PM
#44
Registered User
10w30 or 5w40 are optimum for this car. If heavier viscosity translate to better luibrication, why not use 10w60?
Thickness does not equivocate to protection. Engine tolerances and oil flow rates also must be factored, and the heavier viscosities also suck power. Flow rate is important since it affects cooling of the bottom 2/3's of the engine. And many racers use 30w oils.
A 5w30 does not quite have the high temperature viscosity of a 10w30, and is more susceptible to HT/HS (hi temp/hi shear). It will also have a higher volatility. After a thousand miles, it will be thinner than a 10w30.
A synthetic or synthetic blend 10w30 will be fine in all but the coldest climates, and an oil like Delvac1 5w40 is an ideal year 'round fill in hot and cold climates. Switching oils and vis a lot is not something I recommend - an engine tends to become "friendly" with an oil, and in addition, if you constantly change things, UOA's become meaningless.
I like LE's 8130 a lot - I more I examine its composition, the more I like it. Motorcraft's new 10w30 (look for the wording "hydrocracked/synthetic" on the back) is an outstanding product made by Conoco, and a runaway steal. If you like to change oil a lot, it is my #1 recommendation in a cheap oil. I also like the MaxLife 10w30.
Thickness does not equivocate to protection. Engine tolerances and oil flow rates also must be factored, and the heavier viscosities also suck power. Flow rate is important since it affects cooling of the bottom 2/3's of the engine. And many racers use 30w oils.
A 5w30 does not quite have the high temperature viscosity of a 10w30, and is more susceptible to HT/HS (hi temp/hi shear). It will also have a higher volatility. After a thousand miles, it will be thinner than a 10w30.
A synthetic or synthetic blend 10w30 will be fine in all but the coldest climates, and an oil like Delvac1 5w40 is an ideal year 'round fill in hot and cold climates. Switching oils and vis a lot is not something I recommend - an engine tends to become "friendly" with an oil, and in addition, if you constantly change things, UOA's become meaningless.
I like LE's 8130 a lot - I more I examine its composition, the more I like it. Motorcraft's new 10w30 (look for the wording "hydrocracked/synthetic" on the back) is an outstanding product made by Conoco, and a runaway steal. If you like to change oil a lot, it is my #1 recommendation in a cheap oil. I also like the MaxLife 10w30.
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