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Forgive me if I bash GM a little. As you know, corvettes come from the factory with Mobil 1 - and the Z06 I owned had a serious oil consumption problem. It came down to faulty rings that were installed on early models - my point is that I feel Gm sometimes takes the cheap why out on parts, materials, and manufacturing - IMHO. I wouldn't have thought to blame the oil in this case. Would it be possible that GM is just taking the cheap route on their Caddy seals? I don't know, like you said - each case is different. Maybe the Conventional-2-Synthethic switch didn't jive bc the synthethic has to adapt to the mineral oils additive that are already built up in the engine??? Anyway, you made very good points - Thanks
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Current Wheels: 86 SVO 1E, 89 Nissan D21 VG30E, 50 Fleetline Cpe
Past Wheels: 94 Vette LT1, 01 Vette Z06, 87 Vette L98, 80 Vette L48
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