Originally Posted By: gregk24
Originally Posted By: surfstar
Originally Posted By: gregk24
Reason I would use this is to help the numerous short trips and starts ups the car sees, so for that split second the engine has no pressure there would be a barrier of protection.
Your engine doesn't care and won't wear out prematurely because of this. You use high quality synthetics and will not have a lube-caused issue in your engine's lifespan.
Use MoS2 if you want to try it though - you may still find benefits (smoothness/quiet? mpg?)
I agree, very few oils today would NEED an extra additive, I just thought the extra moly might be of some benefit in one way or another.I was just concerned that it might do more harm than good over the course of a full 6 month OCI.
It will do no harm, regardless if it's a 6-month OCI or some other duration. Towards the end of your first MoS2 use, you might notice the oil is actually getting lighter in color since much of the MoS2 has attached itself to metal parts.
Your engine won't notice the brief instant in which there is no oil pressure on start-up. A few vehicles (my Subaru!) actually permit you to crank but not start the vehicle to build oil pressure prior to starting, but I don't know anyone who uses that feature. The "engine doesn't care" comment misses the point - most wear on an engine occurs in the first few minutes of operation. The oil may be pumping but it is not lubricating as well as it might. Yes, modern synthetics are much better in the start-up department, but they're not perfect, they do drain down, and they don't flow as well cold as hot.
With either synthetic or dino oil, the accelerated wear at start-up won't make your engine wear out prematurely, in part because car makers factor it into their estimated product life. Terms like 'prematurely' or 'lifespan' are at least as slippery as the oil. Does it mean the warranty period, body-rust-out period or what? If you could reduce or eliminate start-up wear, your engine's 'lifespan' might be significantly increased and MoS2 may do this for you.
After MoS2 has been in the engine for a bit - maybe 500 miles - it forms a plating on bearing surfaces. This plating doesn't drain down into the pan when you stop the engine. On the next start-up, MoS2 is lubricating from the very first movement of the internal parts - about what you would expect from a dry lubricant. So, MoS2 should be of some benefit. Other benefits might include reduced parasitic or friction heat output, more efficient engine, limp-home protection.