Vtur
Well-Known Member
You got me curious. I'm going to send in a sample on my next oil change, which will be 7-8k miles used. Been using Qstate since day 1, with 7-8k interval.Based on the dozens and dozens of EcoDiesel UOA reports I've seen, Quaker State ranks the lowest on how well it holds up. If you're running Quaker State in the EcoDiesel, I would cut the oil change intervals to about 6,000-mile drain intervals. Even at 6,000 miles, the oil is already testing in the 5W-30 range. For whatever reason, the 3rd gen EcoDiesel is hard on oil. We're seeing a lot of shearing even with the good quality oils.
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