Join Date: Dec 2008
Location: Tyler, TX
Thanked 407 Times in 347 Posts
I have not seen any engineering data about the maximum fuel dilution allowed. We used to see 6% commonly on engines that idled a lot, but we never lost an engine from an "oil related failure", they WORE out. Two times we launched a rod, once was when an engine overheated, was "repaired" and placed back into service. The oil cooler was plugged with silicone worms, and the rod bearing on #3 cylinder failed. Not a dilution/oil problem. The next engine lost a rod in the morning after a cold start (-25*F) when the driver set the hand throttle after starting it and it went WOT with cold oil.
I don't see 4%-7% dilution causing this, but with 10W-30, it *could* I suppose. It all depends on what oil you are running and how the vehicle is used.
Look at it this way. If you doddle around town for 7,000 miles, do 10+ regens, then take it into the mountains with 5% fuel in the oil and 10W-30 oil pulling a 10,000# RV, you will potentiall do damage. In different scenarios this would not be a problem, and it may not in this one.
'93 F-250 HD, 7.3L IDI, 5spd - FARM TRUCK
I Support: Trailer brakes an every axle over the towing vehicle's GVW; CDLs for RVers; Safety inspections for ALL vehicles and 6 axle trucks (97K GVW proposal).
Democracy is two wolves and a lamb voting on what to have for lunch. Liberty is a well-armed lamb contesting the vote - Benjamin Franklin
I vote for LIBERTY!