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Of all the basic maintenance items oil changes are easiest. I do based on miles/time. All engine powered stuff lasts longer.
Getting ready to pull racecar engine to go through cylinder heads, check rotating assembly, replace seeping oil pan, swap converters and verify nothong going south ahead of fall racing season.
This engine uses conv Castrol GTX 20w-50 and internals look new when pulled apart. The abuse this engine gets is solid test of effective oil. The only real wear I ever found is pistom ring gaps. After 6 years running, went from .022 to +.060. Thin 3 mm race rings.
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