Shell Rotella T and T1 oil

I can't actually find a spec sheet for Rotella T1 HD SAE 40 but they are out there for T1 without the HD designation.

If I were you I would stick with what you know works on those old girls but did happen to notice that on the spec sheet I post the link to below it does say approved for DD two strokes but not recommended for high speed engines which seems to be a bit of a contradiction to me.

http://rotella.shell.com/products/t1.html

I like to stick with the one type unless there is a compelling reason to change.

I will shortly be running 4000 series MTU Main engines and CAT Gensets on the same vessel.

Contractually we have it that all engines will run on the same lubricant as we will be carrying around 2500 US Gals of it and it removes the chance of filling with the wrong stuff.

Another one to consider, which I got great results from, is the NAPA 75118 if they still have it; some locations had to order it, others like the one on SR84 in FtL used to floor stack it. I pretty much settled on either it or the DD rebranded Mobil Delvac. The 75118 is rebranded Valvoline and has one of the lowest ash %, somewhere around .6 IIRC. I was doing three or four oil changes a year when we were cruising full time. Here in NC, Covington (then Western Branch) sold me the DD for the about the same as the NAPA, so why not?
If you search the Hatteras Owners Forum, there is a comparison of the ash ratings for several oils in a few posts.

I think if you double check, the Kendall Super D is not Cf2 rated. At least it wasn't 7 years ago.

I've been using the NAPA oil for over 12 years on ours and all 2 stoke Detroit engines since the start of our company.
I usually only stock 75118 and 75121 for most of our customers.
Cat SOS oil lab results always come back very well regarding oil quality after 200-300 hours, some longer.

API rating is CF-2.
Web site just says CF but the pail says CF-2.

I can take a pic of one of my pails in a few days.

Thanks, I guess I wasn't aware of all the different variations of Super D, looks like D3 is the Cf2 flavor, so it would be helpful to others to specify.

RC: I just so happen to have a pic of a 75118 label right here:

The Ash content is not such an issue for you guys running old DD's with no filtration /after treatment as it is for anyone using a DPF.

Slow, damp & cool morning here (Jax FL). Glad you got that pic. Think I'm going to stay in with my new kitten.

Think everything that needs to be noted, is there on the label.
Like I mentioned above, We offer Cat SOS oil test during our oil services. Every report comes back good on oil quality.

I found my Detroit factory oil spec guide dated 2005. It is in PDF and 577 kb in size.
I do not think I can attach anything to PM so if you would like a copy, PM me with an e-mail address where I can send this.

I always had an oil analysis every time I changed and got very good results. I, and Detroit, disagree with Kiwi, the factory service manual goes to lengths on the oil's sulfated ash and the fuel sulfur (the lower the better) spec and does not discriminate as to how the engine is equipped. If less is better, why not get less?

And I, and Detroit, disagree with that. It's the one oil spec for those 2 stroke engines they go out of their way to highlight. And the ash maximum % is lower for 2 strokes than 4's: <1% vs <2%.

On a additional note, I use the same 40w (CF-2) in my TD-514 clutches. No API rating required from TD, just quality 40w.
Oil crystal clear, pressures perfect. Not bad for untouched '78 clutches.