P.S.
I'm running ALL SYNTHETICS including engine, transmission/transfer/differential, plus brake fluid and power steering. Again, I think it's a good insurance policy against future potential problems/challenges. One thing i will add is that I've always used Castrol synthetics (i've owned a bunch of british cars.....Castrol is the 'Thing' with british). However, i found through news updates (and publicized law-suits) that Castrol started using petroleum-based stocks in their synthetic oil to cut costs a few years ago which meant that they were NOT really 100% 'synthetic' any more in the true sense of the word.
If you use synthetic engine oil make sure it is a 'Group 4' synthetic and NOT 'Goup 3' synthetic OR less.
Mobil 1 'extended service' is a 'group 4' oil (Red Line and some others are too, but i have not used them). I am now using Mobil 1 Ext. Service.....for what it's worth. If you change every 2000-3000 miles, it may not be a big deal. I do change at 2500 miles but I still use 'Group 4' oil.
Needless to say, i do believe in synthetics for mileage increases and longevity although sometimes you may think it's too expensive. I think NOT!
I do get 16-17 average (even with an Alpine Superchager w/7 psi boost) and have hit as high as 23 mpg on highway with average 60-65 speeds.
Synthetic is the way to go!
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