Oils and ZDDP

I'm doing my yearly oil change tomorrow [2500 miles~], and for the first time I'm using ZDDP additive. ZDDPlus, from the company that makes it. That, and Castrol GTX 10W-40.

I still don't know what to think of all this; I guess I'm being cautious. Snake oil salesmen abound...

N

As you know, Porsche does not recommend additives, (of course that was probably also true at the time when oil HAD ZDDP!) and I had the same thought as you, why not add some!

Oil discussion can be very complicated as you no doubt are aware by now and everyone has a position. The only thing that kind of bothers me about ZDDP Plus is the statement that you use 4 oz for every 4-5 quart oil change.....seems a little in-exact.

One other comment, with you being in Fla, I would think you would want to use 20w50 due to the heat? I use 15w40 in Va. Just a thought.

Good Luck!

There are several oils available with sufficient ZDDP and the correct viscosity already. I much rather get what I need straight out of the bottle than to cocktail my own, but that is just me.

Ive used full synthetics for both my 928s since day 1..........Mobil 1 15w50 and Amsoil 20w50

The GTS was consumming oil at a rapid rate until I switch over to Amsoil Zrod then drove the car to Kansas and back, 6000 kms........it hasnt used a drop since

Attached files [img]media/attachments/13468=1560-amsoil.JPG[/img]

Strat_928;13464 wrote: As you know, Porsche does not recommend additives, (of course that was probably also true at the time when oil HAD ZDDP!) and I had the same thought as you, why not add some!

Oil discussion can be very complicated as you no doubt are aware by now and everyone has a position. The only thing that kind of bothers me about ZDDP Plus is the statement that you use 4 oz for every 4-5 quart oil change.....seems a little in-exact.

One other comment, with you being in Fla, I would think you would want to use 20w50 due to the heat? I use 15w40 in Va. Just a thought.

Good Luck!

Hey-

I used to use 20W50, but the reality is that here in South Florida, it never really gets over about 93 degrees/33 C, due to the proximity of the ocean. Michigan is hotter than Fort Lauderdale in July, trust me. That is the big debate that I have with friends from northern climates: "How can you stand the heat down there", well it really isn't any hotter. In fact, it is slightly cooler in the summer down here than up north.

But our winter? Two days ago, I woke up, put on a bathing suit, and barefoot....backed the 928 out of the garage and washed it in the driveway. It was 75 degrees at 0730. Try THAT in Michigan this time of year!

I used 20W50 for years. I work for an airline, and I generally have a week on/week off schedule. What I noticed was that due to my schedule, when I came home and started the car, at first I noticed some blue smoke. When I changed to 10W40 this didn't happen any more. The owners manual says that 10W40 is proper for my temperatures, which range from a low of 50 degrees/10C on a cold winter night to a high of 93/33C.

I still don't know what to think about the ZDDP additive.

N

I would venture to guess that NO auto maker recommends any oil additive. Opens too many doors to lawsuits. Just my opinion. I would not put too much thought in the fact that Porsche is in that group as well.