Lou C
Supreme Mariner
- Joined
- Nov 10, 2002
- Messages
- 13,296
the important thing to remember is that you cannot generalize from one example to all families of engines. DI engines have their own set of issues that were a non-issue with port EFI.Tell that to the Owners of the GM 3.6 LTT Engines after DI was introduced. Extended Oil Change Intervals, even as low as 8000 miles resulted in Excessive Chain Wear. Mine were replaced after 8 yrs and 70,000, under Warranty. GM extended the Warranty to 10 yr and well over 100K.
if you really want to do it right, do consistent engine oil analyses, then you will now what's happening inside your engine as far as you can, and decide on what's a good oil change interval. Wear metals rates and also TBN, will tell you if you're changing it often enough.
On the vehicles driven longer distances in our family, we do 6-7,000 miles, and found that oil analyses supported that this was certainly adequate. On the older vehicles not driven much, I like to do a change every 6 months regardless of mileage, that's my '98 Grand Cherokee 4.0 (182,000 miles) and my '07 Grand Cherokee 5.7 (133,000 miles).
The best thing about the analyses is that you will know if a serious problem is developing before it leaves you with a big problem like antifreeze in the oil (the silent engine killer).