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Thanks Steve. 15/40 Dino SRT it is. I will never ride when it is below 32F. I am a cajun boy, we are not wired for that stuff.

The motor is water cooled. So there could be sound reasoning that a 50w should be used in my temps. Ummm.... I was convinced that a 15/40 HDEO or 5/40 Syn would work with no compromises.

I replied before I saw your reply CuriousKid.

Yes it is a euro bike, KTM. I am not really trying to find out what oil to use. I am interested in why the OEM says that a heavier 10/50 is better in temps over 32F than a thinner 5/40. What is the reasoning behind this?? Heavier oils better in hotter temps??? Why?? Also, I would think that...

What is the harm in using a 5/40 instead of a 10/50? One of my bike's manual calls for a 10/50 Syn with temps above 32 degrees and 5/40 Syn below 32 degrees. I live in South La., I won't be riding when it is that cold anyway. I am wondering what is the harm in using a 5/40 above 32 degrees year...

What is the harm in using a 5/40 instead of a 10/50? My manual calls for a 10/50 Syn with temps above 32 degrees and 5/40 Syn below 32 degrees. I am wondering what is the harm in using a 5/40 above 32 degrees?

Yep, I change the fuel filter every Jan 1st.

Ok, thanks for replying.

Sweet! Thanks sharing what you know fellas! Blanco

South Louisiana climate Manual calls for 5/30, I have be using 5/30 Mobil 5000 with OCI 5000. I am in the pest control business. I put about 30K miles a year on a vehicle. I drive 20 miles into town, then about every hour or so, I start it up and drive for 10-15 mins. After doing that during the...

Thank you so much for posting that link. I learned an awful lot from that.

I race Enduros and generally put 4 to 5 hours of hard use every ride with a 450 wet clutch. I have come to the conclusion that either the Shell Rotella 15/40 Dino or the 5/40 Synthetic will do well in my motor. I have a few questions for you guys. I plan to change the oil at 15 hrs of use. 1...