9two8

Quite a few different brands of 20/50 here in UK

Ken
80 928 S
5 Speed

UK

jeff spahn

yet . . .

Strat_928

There is an alternative. It is hard if not impossible to find ZDDP in oil with the original amounts anymore. Most have stopped making it altogether. Rotella even stopped making it. However, I after research on their website, the replacement for that is called Rotella-T Triple Protection - 15w 40.

According to their site it is actually more protective than the ZDDP version they used to sell. In any case they have a rep for making good oil. Fleet trucks use it quite a bit to help prevent wear.
I have been using it for over a year now. One nice side benefit is that you can buy a gallon at Wal-mart for 18.00 or less.
Shell has a lot of versions of Rotella, so be sure to get the Triple Protection. Here in a temperate state, 15w 40 is just fine. I can understand being able to use 50 in Texas and Fla etc. but it also gets cool here for many months. Anyway, another option for you. I would think in Europe, Rotella is an easy find as well.

Also - if you check the manual, they have a chart showing different climates and oil viscosities. 15w40 15w50 and 20w50 are all listed with the corresponding temps. It is a pretty wide range. Plus if you only get 5k or so a year and change it anyway once per year. I think you are in pretty safe territory. Daily drivers may be a little more sensitive.

antlee928

Yep, there have been long and hard debates aboiut the oil subject. The informed and general concensus is no less than 15W50 and typically 20W50. Importasntly though is the Zinc (ZDDP) content it needs to be at least 1000-1100ppm on the low side to mitigate any wear issues in this motor. Personally i use Valvoline MaxLife 20W50 and motor feels great. Of course there are other equally and better hi ZDDP rated quality oils to choose from.

Cheers

Don Carter

The Triple protection web page is pretty impressive, but what about T6? It's the newest Rotella and is full synthetic.

I work for Shell, but I'm not an engineer, nor do I work in the Lubes part of the business. I did have a conversation with one of our lubes scientists a couple of years ago about the 928 engine. My impression was that they don't publish zinc content anymore because they discovered new ways to keep the additives in the oil longer, so you don't need as much. Older oils had more because it was understood the additives would gradually leave the oil.

All this said, I have not switched yet, but plan to since M1 15-50w is not that easy to find anymore (not always at Walmart). So far I've only seen T6 in 5-40, which could be an issue.

U-928

Whatever's around...it leaks or gets burned out anyways....lol

dr bob

My local (Arcadia) Wal-Mart doesn't regularly stock the 15W-50 M1 Extended Life in the 5-qt bottle, but the one near my parents (30 miles or up to three hours south in L.A. traffic...) has it regularly. 4 Bottles (all they had on the shelf) made it into the cart last week, so I should be OK for a couple more years anyway, with what I had already. It seems like a crapshoot whethere a particular store carries it. I asked at the Valencia store (15 miles north) and the area stocker said they don't carry it because they don't sell any. Duhhh!

Answer to the eternal question about which came first, the chicken or the egg: The egg. Fish and other marine life spewed eggs long before there was even a thought of a chicken.

Strat_928

Don - I did read about the T6, but I had decided not to use synthetic for now anyway until I pull the engine and replace some seals and gaskets.. Might be a good option, but I did not read up on it as much as the Triple Protection since I needed Dino....

hacker-pschorr

What amount of ZDDP would that be?

AirtekHVAC

so...Amsoil 20w50 has high ZDDP....I know a distributor, and can get a good price...is it good for the ol 78?

kurt_1

there are some 50 and 60 oils available:

Motul 300V competition 15W50
Motul 300V Le Mans 20W60
(oil analysis has shown that they still contain about 1100 ppm zinc and phosphorus after 1 year of use)
Castrol Edge RS 10W 60
Mobil 1 Peak Life 5W 50

probably more, all pricey stuff, though!

HTH!

Kurt

dprantl

I really hate that chart in the manual. It says that 15W40 is good up to 110 deg F ambient? No way in hell! And those two multi oils go off the chart with arrows, how far? Mobil 1 15W-50 still has high enough ZDDP, pours very well at even 30 deg F and works well at 100 deg F ambient. Why put something thinner in a 928 unless the temps where you drive do not exceed 60 deg F or so?

Dan
'91 928GT S/C 475hp/460lb.ft

GlenL

Right. I'll start my cars at -10F to -20F! And it won't be 60F outside for a couple of months.

That chart is great, I think. Really lays out the opportunity to use other oils. It's referencing oil circa 1978 but it does give freedom to adapt to the actual conditions.

TYP928S

dr bob - 4 Bottles (all they had on the shelf) made it into the cart last week, so I should be OK for a couple more years anyway, with what I had already.

Don't mean to hi jack this thread but what is the shelf life of Mobile One???

I still have 5 quart containers of 15w50 with the red cap plus a few of the "new" jugs before my Walley Mart stopped carrying that grade.

Again, sorry for the hi jack,

jon '84 US Auto

SeanR

Doubt there is much of a shelf life. It stayed in its original holding tank for millions of years