Steve Weiner-Rennsport Systems

JPS,

Mobil appears to be playing games with their 15w-50 product. Although its rated SL/SM, they only list the Phosphorus content around 1000ppm without mentioning Zinc content and IMHO, thats on the low side of what you should have.

Speaking only for myself, I find that not only is that somewhat incongruous but I'd prefer to see 1100ppm or better of both P & Zn for proper protection in these engines. I've yet to see a disfunctional (failed) catalytic converter due to ZDDP contamination.

My collection of pitted 993 camshafts slowly continues to grow,...........

Brad-Penn or Swepco for me,....

WHB Porsche

Steve,

Which weights of BP/Swepco are you referring to? 20w50 (BP) and 15w40 (Swepco)?

JPS

Thank you Steve, for this and all your other posts on the board. So for a track/street 95 993 not used as a daily driver (living in Manhattan and owning a 993 makes little sense...trying to actually drive it in the City makes even less...), I'm guessing you are advocating the BP 20/50 at 2500 or so miles change interval?

Thanks,
Jos

Amfab

OK Steve, I am now leaking green

Thank you

Steve Weiner-Rennsport Systems

Hey Charlie,

Yessir, that be the very ones,...

Steve Weiner-Rennsport Systems

You are quite welcome,...

I change oil every 3K for street use and that keeps all the engine innards in good shape.

Charles Navarro

Summary, if using Mobil 1 0w40, it's probably not a bad idea to switch to Mobil 1 Truck and Diesel 5w40 or the new Mobil 1 High Mileage 10w40, both of which are SL rated.

If there is no catalytic converter, Mobil 1 MX4t (4T Racing) 10w40. If using Mobil 1 15w50, loose the catalytic converter and consider using Mobil 1 V-Twin in it's place. Royal Purple Max Cycle also should be an acceptable alternative, sans cat.

If excluding M1 products, then Brad Penn 20w50 and Swepco 306 15w40 should be fine for cars even with catalytic converters.

How about that? With the Brad Penn, I've found that 6 months or 5,000 highway miles gets you right to 50% of the starting TBN for the 20w50 Brad Penn. I'd figure you could probably go a bit longer with the Swepco, but there really isn't much of a point to do so. With the motorcycle oils, figure probably closer to somewhere between 3 and 4k miles, as they have about 15% less starting TBN than the Brad Penn.

ddidit

This Mobil 1 issue is getting great:

On the EVOM forum, Mitsubishi had made an addendum that the oil change interval for the EVOX is 3k and not 5k. What!!!! What ever happened to how great Mobil 1 is and its long interval change.

The funny thing about the whole thing is the onboard computer has 5k for the interval change still from the factory. Seems mistubishi has discovered something on their test stations. I wonder if this is the first recall to have there computers updated. Check this part out, if you don't follow these maintenance schedules, you warranty is void, period. This may be a way for them to reach a more upscale client for there flagship EVO and get idiots out of the car that can barely afford the payments much less change the oil every 3k a $60 a pop.

Mobil 1 5w-30 is what they recommend for all weather fill. Doesn't anyone know what is right! I just keep using the brad Penn because my car has never driven better. Even my esprit is rpming smoother. Thank you Steve and Charles.

dutchcrunch

THANKS STEVE & CHARLES I appreciate the info , BP for me. dont have to tell me twice.

Richard C2S

Thank you to both Steve and Charles.

Charles, did I correctly pick up from one of your recent posts that the "new" Mobil 1 Hi-Mileage 10W-40 would be safe?

I posted earlier this morning (before checking here) on the 911 Forum at Pelican:

So, guys:

What is the verdict (as of today and until something else changes)?

I have an '81 911SC and a '98 993. I have been using Mobil 1 15W-50 in both cars. I don't at all object to going with the Brad Penn or Swepco if that is the only way to play it safe.

But, is it safe to use the presently available formulation of Mobil 1, in either the Porsche recommended 0W-40 or the 15-50 that I have been using for years, in either car?

I actually bought (two weeks ago) a few 5 quart jugs of Mobil 1 Hi-Mileage 10W-40 at Wal Mart. This stuff, which is supposedly "new", is NOT SM or CJ4 rated. I used 6 quarts when I changed the oil & filter in my A4q. I am wondering if I would be safe to use it in my 911s, even tho neither is a "high mileage" car.

I appreciate your thoughts. Thanks.

Charles Navarro

Yes, the High Mileage 10w40 is indeed an API SL rated probably an excellent alternative to Mobil 1 0w40 (and probably about equal to the Truck and Diesel 5w40).

IMHO, the current M1 15w50 formulation shares nothing in common with the tried and true original formulas from a few years ago and unless Mobil did thorough testing to prove it's of equal or better performance compared to the old version, it's not a proven product. It's just a new oil from a well known brand filling the spot of a previously excellent oil. The Swepco and Brad Penn formulations have been around for a LONG TIME and have not been changed and are proven.

maurice97C2S

Charles, does your advice apply globally ?

If you are stating an API SL rating is the key, then my Mobil 1 0W 40 'Protection Formula' purchased from Costco in the UK carries API SJ / SL / SM / EC / CF ratings in addition to ACEA A3 / B3 / B4 ..

Was this a US only catalyst preservation issue ?

Thanks for your advice,

cheers, Maurice

Charles Navarro

No, you nailed it right on the head - it is API SJ, SL, SM... if you see SM anywhere, as it supercedes all previous API specifications, my recommendation of no SM or CJ-4 to be on the safe side still applies.

maurice97C2S

BTW, the December 2007 Approved Oils TSB lists even more M1 variants, and they have introduced an 'Approved Until' date ..

cheers, Maurice

Richard C2S

Thank you, Charles.