I here from some people that synthetic oil is not good in diesels,but others say it is great for diesels,I do use it in all my other cars truck and rv and other gas engines and love it ,my hunter dealer said not to use synthetic oil,has anybody used it in a yanmar diesel for a long time in a newer engine.
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Not good for ANY new engine.
Nick: If you look around most mfg. do not want you to use synthetic in a new engine. Most automobile mfg recommend 10-20k miles before switching to synthetics. My understanding is the oil is too slippery and does not allow the engine parts to seat properly. When engines get too old syntheic oil will sometimes cause your engine seals to leak. There have been several posts about this exact subject over the years. Some swear by the synthetics. Yanmar rates these newer engines for 10k-12k hours. This is based on using petro based oil. If my engine lasts that long on petro based oils it will outlast me (approx 1200 hrs in 15 yrs). I never saw any real advantage to using a synthetic oil in the boat. You need to change it every year anyway because of the fuel contamination. So the only real difference is that you spent $5 for a qt vs $1.50. You may get slightly better lubrication on start up too. I'll spend my few extra bucks on Yanmar filters and beer, thank you!
Nick: If you look around most mfg. do not want you to use synthetic in a new engine. Most automobile mfg recommend 10-20k miles before switching to synthetics. My understanding is the oil is too slippery and does not allow the engine parts to seat properly. When engines get too old syntheic oil will sometimes cause your engine seals to leak. There have been several posts about this exact subject over the years. Some swear by the synthetics. Yanmar rates these newer engines for 10k-12k hours. This is based on using petro based oil. If my engine lasts that long on petro based oils it will outlast me (approx 1200 hrs in 15 yrs). I never saw any real advantage to using a synthetic oil in the boat. You need to change it every year anyway because of the fuel contamination. So the only real difference is that you spent $5 for a qt vs $1.50. You may get slightly better lubrication on start up too. I'll spend my few extra bucks on Yanmar filters and beer, thank you!
synthetic oil
Steve is right! I've used synthetic oils for years in race and car engines, and you can't start with syn oils until the engine is thoroughly broken in, otherwise the rings won't seat properly. 0n production cars, you should wait until at least 10-15k miles. that's a long time in yanmar-years.
Steve is right! I've used synthetic oils for years in race and car engines, and you can't start with syn oils until the engine is thoroughly broken in, otherwise the rings won't seat properly. 0n production cars, you should wait until at least 10-15k miles. that's a long time in yanmar-years.
Check the following post
Check this post"Synthetic Oil for Yanmar engines at the yanmarhelp.com. Dick confirms all the other post. Don't waste your money.
Check this post"Synthetic Oil for Yanmar engines at the yanmarhelp.com. Dick confirms all the other post. Don't waste your money.
Not for seldom used engines....
Synthetic oils do lubricate very well, and were originally invented for jet engines operating in below zero cold air. *The synthetic oils don't thicken. Because of it's great anti-friction qualities, that's the reason not to use synthetic oils during engine break-in. The problem with synthetics is that the synthetic oil slowly drains-off engine parts in a shut-down engine. Mineral oils maintain an adequate oil film much longer than synthetics. What that translates to is with synthetics, if you haven't fired-up your engine for a couple of weeks it will be a "dry start" until the oil starts pumping. So...if you run your engine very often, synthetics are probably okay. If you only start your engine every couple of weeks, don't use synthetic oil or you'll be needing rod bearings much sooner than expected!
Synthetic oils do lubricate very well, and were originally invented for jet engines operating in below zero cold air. *The synthetic oils don't thicken. Because of it's great anti-friction qualities, that's the reason not to use synthetic oils during engine break-in. The problem with synthetics is that the synthetic oil slowly drains-off engine parts in a shut-down engine. Mineral oils maintain an adequate oil film much longer than synthetics. What that translates to is with synthetics, if you haven't fired-up your engine for a couple of weeks it will be a "dry start" until the oil starts pumping. So...if you run your engine very often, synthetics are probably okay. If you only start your engine every couple of weeks, don't use synthetic oil or you'll be needing rod bearings much sooner than expected!
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