First oil change

[flynrider]

Seems to me the stuff I was using was a 15w40. Not sure if it was a t5 or t 6 but there does seem to be some discussion on the net that the formula was changed, along with a name change.

Google informs but it doesn't discuss lol

Shell changes the formulation and specs every few years to keep us all guessing.

For the last few years, plain Rotella T was a 15w-40 dino oil that met the JASO-MA spec. That's what I used to use, but was having heat/shear issues in the extreme summer heat.

The synthetic T6 5w-40 is a synthetic that also met the JASO-MA spec and is what I use now.

Rotella T5 is a synthetic/dino blend, but as far as I know has never met the JASO spec.

Since Shell is fond of changing names, formulations and specs, it's a good idea to check the label on the bottle and make sure it meets the spec. For example, Shell makes two types of T6 synthetic (0w-30 and 5w-40), but only the 5w-40 oil meets the JASO-MA spec for motorcycles with wet clutches.