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07-21-2017, 10:17 AM #10Junior Member
- Join Date
- May 2017
- Location
- Amarillo, TX
- Posts
- 19
T4 is conventional oil, T5 is semi synthetic, and T6 is full synthetic. I switched at 400 hours to the Rotella T5 15/40 and change it every 100 hours and the black stone labs oil test shows all is good!!!
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