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What Oil are you running in your Diablo

2107 Views 41 Replies 13 Participants Last post by  oldsouth
Curious as to what oil most of you are running. I was considering Mobil 1 15W50 full synthetic.

Mobil 1™ 15W-50

Or this

Mobil 1™ FS 0W-40
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So to help provide some insight on cam wear, in the 1990's through early 2000's oil type was a concern in Corvette circles as synthetics became more popular. For early C2 and C3 Corvettes, cam wear was reduced with high zinc oils. The 1990s C4 engine design reduced engine wear design issues and synthetics became the oil of choice due to their long term stability. The concern back in the 90s was that the synthetic oils at that time were not as effective as zinc for coating the cam surface creating more heat from added friction which translated to cam wear.This logic would definitely apply as well for the Countach.

Synthetics have improved dramatically over the last 20-30 years and it would be interesting to hear from a real engine oil expert as applied directly to the Diablo engine design. I suspect what they would say is both high zinc and synthetic are acceptable but if using a non synthetic oil, change oil frequently.

My 91 Diablo has 53000 km and has not had any issues. I have owned it since 2005 and taken really good care of it doing most of my own maintenance and the car has been bullet proof due to proper maintenance. My head explodes when I read about owners who let the car sit idle for years and expect it to be as reliable as a regularly driven fully maintained Diablo.
Warning: I would never use full synthetic in a Diablo motor (only semi-synthetic), full synthetic could easily leak into the spark plug chambers and out the head gaskets due to the finer molecular formula...
 

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So I’m resurrecting this thread. I have some AGIP I bought in bulk (sealed bottles) about 3-4 years ago. Would you still use? Btw I used rotella 5/40 before I bought this and had a good oil analysis.
Why not? If sealed, I would think it's good to go. Still have your FGT?
 

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The only reason I can think of as to why it might be bad, is if there’s additives in it. Maybe those additives might degrade over time????

not too sure what I would do. Use it on less expensive cars???
I would think the oil/additives breakdown with heat and friction. It's only been sitting in a bottle for a few years. I'm sure the stuff you get at the parts counter for your other cars has been in storage in a box for just as long. Could be wrong though.....
 

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So I’m resurrecting this thread. I have some AGIP I bought in bulk (sealed bottles) about 3-4 years ago. Would you still use? Btw I used rotella 5/40 before I bought this and had a good oil analysis.
Is that SINT2000 ? AGIP as a brand was changed to ENI more than 4 years ago...in fact, looks like it was 9 years ago...

I would only recommend using if the oil is semi-synthetic SINT2000, with an ENI label and reviewing the link below.

If the label on the outside is AGIP (and not ENI) I think it is past its expiration.

this link has some good pointers
 

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Yes I’ve read so many oil shelf life threads I’m still confused.

Boneheaded I still have my FGT. Do you??

Here is a pic of the bottle.
Last time I saw bottles in that format was in the 90s, maybe that style container was made more recently but probably more than 10 years ago and at least 6 years ago it was rebranded i-Sint... those containers might have been vintage when you purchased. Probably best to go with Liqu Moly
 

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I use 05W50 because my engine starts up with way too much oil pressure and engine runs hot, so I don't risk it with xxw40.
There is no need to use Agip oil, if it is difficult to find. Any good brand that meets API latest clasification, is good. Don't use too thick cold side oil as close to 0 as you can go, is the best. Remeber; oil thickness does not mean wear protection, best wear protection oil to day are 00w15 that hybrid and "Start Stop" engines use, because they mostly do cold starts.
 

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Warning: I would never use full synthetic in a Diablo motor (only semi-synthetic), full synthetic could easily leak into the spark plug chambers and out the head gaskets due to the finer molecular formula...
I m using 5-40w fully synthetic in my new overhauled engine , there are some leaks from valve covers into spark plug chambers . I will try semi-synthetic see if that helps
 

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Never ever use mineral oil in Diablo, full synthetic oil only!
Synthetic oil actually holds better inside engine and it is urban myth that syntechic oil leaks through seals.
infact, I can not think any engine that works better with mineral oil.

If anyone haave problem with oil leaking to sparkplug hole, change cam cover gasget, that is what gasget does, it seals oil leaks, if not change it.
Original gasget was without any sealant and I do not use any silicone on cam cover gaskets.
 

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Never ever use mineral oil in Diablo, full synthetic oil only!
Synthetic oil actually holds better inside engine and it is urban myth that syntechic oil leaks through seals.
infact, I can not think any engine that works better with mineral oil.

If anyone haave problem with oil leaking to sparkplug hole, change cam cover gasget, that is what gasget does, it seals oil leaks, if not change it.
Original gasget was without any sealant and I do not use any silicone on cam cover gaskets.
If one was to transition to full synthetic, is that a simple matter of doing an oil change to new oil? Or does one need to evacuate all oil reservoirs and do other non standard procedures?
Tia
 

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Never ever use mineral oil in Diablo, full synthetic oil only!
Synthetic oil actually holds better inside engine and it is urban myth that syntechic oil leaks through seals.
infact, I can not think any engine that works better with mineral oil.

If anyone haave problem with oil leaking to sparkplug hole, change cam cover gasget, that is what gasget does, it seals oil leaks, if not change it.
Original gasget was without any sealant and I do not use any silicone on cam cover gaskets.
Thank you Mikael for your advise . [emoji1303][emoji1305] yes the cam cover leaks . Perhaps it’s the quality of gasket although they are new .
 
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