Originally Posted By: dnewton3
I will admit that large, significant shifts in oil selection might have some effect. Going from a 0w-20 to a 15-40 at start-up might make something a bit noiseier or quieter.
I would agree. The only time I've ever had a noticeable difference was with my 1984 F-150 with the 4.9L before the rebuild. That engine was leaking, rattling, knocking, and had crankshaft play. So, with MaxLife 5W-30, it ran noticeably quieter, as it did with 15w-40 HDEO. It was noisier with Mobil High Mileage, as noisy as with any regular conventional oil; I didn't expect that.
However, with a well maintained engine, I don't think that one could hear the difference between, say, QS 5w-30 and Castrol GTX 5w-30. If one went from 5w-20 to 20w-50, perhaps then....
I will admit that large, significant shifts in oil selection might have some effect. Going from a 0w-20 to a 15-40 at start-up might make something a bit noiseier or quieter.
I would agree. The only time I've ever had a noticeable difference was with my 1984 F-150 with the 4.9L before the rebuild. That engine was leaking, rattling, knocking, and had crankshaft play. So, with MaxLife 5W-30, it ran noticeably quieter, as it did with 15w-40 HDEO. It was noisier with Mobil High Mileage, as noisy as with any regular conventional oil; I didn't expect that.
However, with a well maintained engine, I don't think that one could hear the difference between, say, QS 5w-30 and Castrol GTX 5w-30. If one went from 5w-20 to 20w-50, perhaps then....