T trajanMember Dave, PYB will work well. And yeah, no need for Ultra if you can get the same result with PYB for less than 1/2 the cost. My owners manual doesn't say anything about severe/normal service, so I just take the OLM and divide by 2 EM, I didn't know about the two. Interesting. Higher price... Pretty much a given 5/11/1012:01 PM Last edited by trajan 5/11/101:36 PM