crw

see- below

looking for a 15w50 oil - not the ones with "API SM/SL"

Suggestions?

Or, just add a bottle of ZDDP to a newer oil?

To quote Steve Weiner in an old thread:

"My only point in offering that link is to say that oil formulations have (are) changed due to the new API SM rating and the EPA-mandated rules on cat life. This resulted in drastically reduced levels of ZDDP which is NOT a good thing.

The bottom line is that if the bottle has "API SM/SL" on it, its NOT the same good stuff as you've been using.

Neil Perry

Mobile 1

PAULUNM

V Twin 20w50.

crw

Some the older thread say Mobil 1 has cut back on the zinc.

V Twin oil (for motorcycles)? OK for PCAR since air cooled also - more lubricants?

NC TRACKRAT

Brad Penn Racing 15W40.

vincer77

They took it out of other formulations due to poisoning of cats, but since motorcycles have not had cats, they have not taken it out yet.

I cannot find any info on a Harley warranty, so the bike manufacturers probably do not have to warranty the cats for 100,000 miles like cars, so ZDDP is likely not an issue yet for poisoning cats. I did find a Honda Warranty and it is only for one year.

crw

Brad Penn Racing 15W40.

Looks like this is a "partially" synthetic oil with ZZDP

OK with these engines vs. "full" synthetic like Mobil 1?

Mark in Baltimore

Redline 10W-40 has great levels of ZDDP the last time I checked. I use it in all of my cars and have had Blackstone check the oil. The life of the oil and additives is remarkable. Brant Giere (bgiere) has a fair bit of data on the oil for his 964 Cup car.

Kein_Ersatz

Mobil 1 V-Twin

FLYT993

+993

been running redline 15W50 for years; and just bought a case of their 10W60 which is going in at next oil change. ZDDP levels are 1200 for their "blue label" oils. VI and HTHS values are also excellent.

RodKnock

I use Joe Gibbs Driven.

http://www.drivenracingoil.com/

pp000830

I use Mobil I brand. On their web site it lists the ZDDP levels for each of their multi-grade oils. Some have a lot some just a little pick the one that suits you.
Here is an old chart, it my need to be updated.

Andy

axl911

Brad Penn for me!!! Been using it for 70+K miles. My cam looked perfect the last time I saw them while changing out some lifters.

I have no problem with pouring in a quart or two of Mobil 1 and plain dino oil bought at a gas station. What is more important is the oil weight.

FlatSix911

Here is the current Mobil-1 chart for 2014 ... 15W-50 is designed for our 993 engines with 1200-1300 ZDDP.

Quadcammer

and you know thats sufficient how?