I put a 40 weight oil in my 96 Crown Vic. I've been a proponent of using thin oils like 0W-20 and 5W-20 in these engines for a while now, and have actually been against putting anything thicker than a 30 into them, but I decided to try it anyway. The oil I picked is the John Deere Plus 50 Supreme 0W-40 synthetic, which is a PAO based oil. http://www.deere.com/en_US/parts/partsinfo/oils_and_lubricants/oil_0w40.html It's pretty much the full synthetic version of this oil http://www.bobistheoilguy.com/forums/ubbthreads.php?ubb=showflat&Number=1062417
My car has been consuming a quart of oil every 1100-1500 miles since I bought it 7 years ago, and nothing I have tried has stopped the consumption. That includes MMO, Auto RX, Mobil 1 High Mileage, Valvoline Maxlife and even Bar's Leak stop leak additive. I bought two 16oz bottles of the No Leak engine oil treatment that claims 2-3x as much seal swell additives as the cheap brands, and used both of them along with four quarts of the JD 0W-40 in my car. It claims to repair rear main seals, which is where I believe most of my oil is going. I wanted a really stout oil to start with so that I wouldn't dilute the additives below SM levels. We'll see how that works....
So far I've put over 100 miles on the car since that oil was put in, and to be honest, I can't feel any difference between the 0W-40 and the 5W-20 Quaker State Horse Power/Valvoline Maxlife mix that was in before. It was 34F this morning when I started my car, and the engine spun over like it was summer time. Fuel economy doesn't appear to have suffered at all based on instant fuel economy readings on my ScanGauge. The engine doesn't feel the least bit sluggish. The engine is also very quiet.
I think I may have to revise my opinion on 40 weight oils in the Ford 2v modular V8 engines....
My car has been consuming a quart of oil every 1100-1500 miles since I bought it 7 years ago, and nothing I have tried has stopped the consumption. That includes MMO, Auto RX, Mobil 1 High Mileage, Valvoline Maxlife and even Bar's Leak stop leak additive. I bought two 16oz bottles of the No Leak engine oil treatment that claims 2-3x as much seal swell additives as the cheap brands, and used both of them along with four quarts of the JD 0W-40 in my car. It claims to repair rear main seals, which is where I believe most of my oil is going. I wanted a really stout oil to start with so that I wouldn't dilute the additives below SM levels. We'll see how that works....
So far I've put over 100 miles on the car since that oil was put in, and to be honest, I can't feel any difference between the 0W-40 and the 5W-20 Quaker State Horse Power/Valvoline Maxlife mix that was in before. It was 34F this morning when I started my car, and the engine spun over like it was summer time. Fuel economy doesn't appear to have suffered at all based on instant fuel economy readings on my ScanGauge. The engine doesn't feel the least bit sluggish. The engine is also very quiet.
I think I may have to revise my opinion on 40 weight oils in the Ford 2v modular V8 engines....