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James Grosso says: I had a great running 1984 Ram 50 4x4 2.6L engine with about 100,000 miles. I put some of the XR-10 (I think that was the name) oil additive in it. This additive is supposed to reduce friction, but caused the engine to start using/burning a lot of oil, when the engine never used oil before. I do not recommend this product. If you want to reduce friction in the engine, I recommend Castrol GTX or Mobile 1 synthetic oil, with no other additives. |
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Jim Benner says: Had a 1977 Cutlass Supreme with a "Rocket" 350 (L34) that insisted on 93 octane despite a 7.9:1 compression ratio. Rumor has it that Olds went to a siamese bore design in 1977 to accomodate the 403, and as such, the inferior cooling jacked the octane requirements on such engines. Could be. All I know is that stock timing and 87 octane was detonation-city. At least it got 15 MPG on a 50/50 City/Hwy cycle. I have a friend with a 1972 Cutlass Supreme with a 350 2 bbl and duals w/turbo mufflers. it gets a blistering 10 MPG. He uses no lead additives, and has no issues with valve recession/burning. Oddly, despite a 500 Lb. weight advantage, his car was no faster than the '77. But check this out - his car ran gladly on 87 octane. Any attempt of advancing the timing beyond stock did not cause ping - it only slowed the vehicle noticeably. It was more than happy to run 87. As a side note, both engines were indestructable. After 170,000 miles, the '77 didn't knock, tap, smoke, or use oil. The '72 was the same despite 90K violent mileage. Oldsmobile was on to something. Sadly, that something that wasn't marketable. R.I.P. Oldsmobile. |