96C4S

Guys i have used 20/50 since ownership of 2 years runs cool and hard.

c993k

20-50 what ? Who makes it?

96C4S

motul

kkim

Chuck,

I believe Steve recommends 15w-50 for a 993. Here are his thoughts on oil viscosity and failed lifters.... yeah, but what does he know, right?

https://rennlist.com/forums/showthre...&highlight=oil

amfp

This "debate" continues. To me, there is no one answer, as it probably depends on driving use, and climate. Plus with all the Mobil 1 oil out there, it is very confusing. I also believe 5W50W was formulated for SUV's. I have no idea how that is different than 0-40, and about 10 other weights Mobil 1 makes. Maybe it is there marketing. But clearly they like Castrol, Shell manufacture make great products.

I've been using 0-40W Mobil 1 for about 5 years. See no need for 15x50 for me. My car sits for weeks sometimes at time and I want the lighter oil to pump up quickly. When used 15x50 and car sat for say 2-4 weeks, I sometimes would hear a slight lifter noise until the oil / proper pressure got circulated. Since using 0x40W, I no longer hear that noise.

I really don't think we will know the right answer. Other than getting higher mileage 993's and compare what has had engine work with different grade oil. But than it will depend again. How often was oil changed, how was it maintained, were engines pressed for high RPMs when cold, low on oil before changes, city/highway miles, track, desert temps, etc.

Bottom line, it is almost like oil changes, some like me change oil every 3K miles, a overkill. But is what I/we feel comfortable with.

eloyex

Factory indicated to Porsche offices here in Venezuela ( hot climate) ,
to use Motul instead of Mobil on 993´s .
Mobil is fine, but motul is by far better.

I had racing motorcycles in the past, and Honda , to mention one, tested all the oils and decided on favor of Motul without hesitation.

Motul has a deep heritage on racing. I guess more than Mobil.
Mobil has more "propaganda" and much more financial muscle than others .

Anyway, i guess both works very fine and should be of no concern what brand you put indise the engines. Excuse bad english.

eloy

csertich

Kim-you are correct. I meant 15w-50.
chuck

JasonAndreas

Oils on the approved Porsche list are below.

In our approved oil list (Type column), the engine oils are identified as follows:

ncp = basic oil not produced conventionally - "non-conventional processing" (synthetic or hydrocrack).

pnp = basic oil with "partially non-conventional processing" (synthetic blend).

cp = basic oil produced conventionally - "conventional processing" (mineral oil). (Engine oil of this quality is no longer approved for Porsche vehicles)


Non-Seasonal "GL" Light Running Oils:

GL oils have good light running properties because of their light low-temperature viscosity as well as a high level of temperature stability. They have a particularly low tendency to evaporate at high temperatures due to their composition. The oils, that meet such high performance requirements, essentially synthetic or hydrocrack oils, can be used without restriction as non-seasonal oils (see approval list, "Type" column).

Non-Seasonal "G" Oils:

"G" oils can be used as non-seasonal oil, but do not have the same light running properties as "GL" oils

Traffic53

thats funny. i don't see mobil 1 15-50 on that list. and thats what most of us are using?

Bull

Be careful with the "factory approved lists". You need to know for what engines it applies.

epj993

Regardless of what's approved *now*, our 993s were built & tested with the viscosities in the owner's manual. I'm sticking with the M1 15W50.

Edward

Remember, factory recommendations are NOT Gospel. Before I get excommunicated for such a heretical statement, consider how many "factory recommendations" we "violate," and more importantly consider the professionals who recommend these things based on the extensive real-world experience they have on 911s.

A few examples off the top of my head:
-How many change oil at 15K miles?
- replace the small filter at 30K miles?
- ditched their engine tray?
- did a manual override switch for oil cooler fan?
- put 18s on a 1995
- installed non "N" spec tires on their car?
We could go on here

All manufacturers "recommend" based on a slew of factors, many of which are driven by cost and/or business alliances (read: $$).

In the interest of safe and sane "recommendations," let's first understand that we tend to "overmaintain" our cars, yes even non-pcars, because it seems prudent to spend less now in maintenance as a hedge against potentially costly breakdowns later. That's our reality. So whatever oil viscosity or brand one uses, it is one's best interest to FIRST consider one's own specific circumstances:

-what year 911 (2.2 carbed, 3.0 CIS, 3.6 DME, wasserboxer, etc.)
-state of tune (stock to fire-breathing monster)
-mileage
-use (commuter, weekend canyon carver, track beast)
-and of course, climate.

For PAG to simply make a blanket recommendation on one viscosity is more than silly, it is a blatant oversimplification that betrays their true intentions: serve the present-model cars and *those* cash-laden customers. Everyone else, be damned. ...was that harsh?
Oh, and all IMHO, of course...


Edward

pcar964

this is a joke - I doubt there would be a single problem with these cars if we all ran the bargain $.98 pep boys generic brand oil on the discount shelf. Yeah I use mobil 1 because i track my car and it's supposedly good stuff, but I doubt the difference (in engine wear and performance) is that big between mobil 1 full syn and bargain basement standard oil. Biggest difference is marketing costs, which are reflected in the price of a quart of oil. Do you think all those Mobil 1 banners and billboards and commercials all over the motorsports world come cheap? Just my jaded opinion.

Plus, why would we listen to some new Porsche bulletin when most of the people working at PAG nowadays have never worked on an air-cooled car?

jkuniverse

Thanks JasonAndreas for posting the chart. Does anyone have any experience using the Castrol Syntec 5W-50 in our engines? It obviously has the wide viscosity range for the hot weather and still thin enough for the cold climate as well. The oil is listed on the chart and I think it was mentioned along with Mobil One 0w-40 recommended by Porsche - I remember reading it in the PCA website.

96C4S

why not keep the factory exhaust porsche recomended, air box wheels suspension, i dont think so always room for improvement. dealers always incorperate cost. I choose whats best.