New to Board, need some oil pointers
- Thread starter HitManX
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Originally Posted By: Drivebelt
One of the reasons the heavier 20W-50's were recommended in many cases 20 years ago, is that the conventional Group I based oils back then just weren't very "robust", so the heavier grades were used to get as much protection out of these oils as possible. Group I oils just don't hold up that well in high heat/stress situations, and the lighter grades didn't hold up as well as the heavier ones in high heat/stress conditions. With the widespread adoption of high performance Group II base oils (at least here in North America since the late 1990's), one can drop a grade (to a 40 weight), and still get much better overall protection than what those old GI based 20W-50 oils afforded back in the 1980's.
I would recommend a CI-4+ or CJ-4 rated 15w40 HDEO (Heavy Duty Engine Oil), like Rotella T or Delo 400 (which are GII based) in place of 20W-50's, these days. These modern high-performance HDEO's offer synthetic like performance.
An alternative, would be the synthetic HDEO's in the 5W-40 variety. The only real advantage of these synthetics is better cold weather performance and they are longer drain capable. But don't let the reasonable price (fleet of 14 vehicles
) of conventional HDEO's deter you, these conventional GII based oils these days offer a very high level of performance. Plus you can readily buy these 15w40's in 5 gallon pails.
Well stated and I recommend the same.
One of the reasons the heavier 20W-50's were recommended in many cases 20 years ago, is that the conventional Group I based oils back then just weren't very "robust", so the heavier grades were used to get as much protection out of these oils as possible. Group I oils just don't hold up that well in high heat/stress situations, and the lighter grades didn't hold up as well as the heavier ones in high heat/stress conditions. With the widespread adoption of high performance Group II base oils (at least here in North America since the late 1990's), one can drop a grade (to a 40 weight), and still get much better overall protection than what those old GI based 20W-50 oils afforded back in the 1980's.
I would recommend a CI-4+ or CJ-4 rated 15w40 HDEO (Heavy Duty Engine Oil), like Rotella T or Delo 400 (which are GII based) in place of 20W-50's, these days. These modern high-performance HDEO's offer synthetic like performance.
An alternative, would be the synthetic HDEO's in the 5W-40 variety. The only real advantage of these synthetics is better cold weather performance and they are longer drain capable. But don't let the reasonable price (fleet of 14 vehicles
Well stated and I recommend the same.
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