Oil for JTS engine - Alfa Romeo Forum
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Oil for JTS engine

Used Castrol Edge 10W60 oil before, both on my 156 TS and 159 JTS.

Thinking about using Valvoline VR1 5W50 this time..good or bad?
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Of all the Alfa engines, only those spec'd for 10/60 (2.0 JTS and GTA) wear out their cams & lifters.

Lots of V6s live their whole lives on 10/40 as per the manual and I can't understand why a GTA need 10/60 especially if it's not being driven really hard all the time.

I do drive mine fairly hard so I run it on 10/50 Silkolene Pro S (now Fuchs) and change with filter every 6k.
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Valvoline VR1 5/50 will be a lot better for your engine than Selenia 10/60 in my opinion.
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I reved my TS engine sooo much more so I had to use 10W60 to make sure it doesnt drink oil.
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Why were you using 10W60 in a 159 2.2JTS anyway...?
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I like to drive hard, not cold ofc.
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Currently using 0W40..probbly the best allround oil, except it gets all black and dirty quick.

Changing oil every 10000 km on summer and 5000 km on winter.
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Quote:
Originally Posted by Pud237 View Post
Of all the Alfa engines, only those spec'd for 10/60 (2.0 JTS and GTA) wear out their cams & lifters.

...
So, do the GTA / JTS wear out their cams on account of the 10W60 oil, or do they need 10W60 oil because they wear out their cams ?
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So, do the GTA / JTS wear out their cams on account of the 10W60 oil, or do they need 10W60 oil because they wear out their cams ?
I'm wondering the same thing, having just changed my oil and using 10w60 (156 JTS)
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Originally Posted by cannotstop View Post
So, do the GTA / JTS wear out their cams on account of the 10W60 oil, or do they need 10W60 oil because they wear out their cams ?
The GTA I'm not sure about, because cam wear on a GTA is still pretty rare. However I can't remember ever seeing it on a 2.5 or 3.0 24v and I've seen lots more of them stripped than GTA engines.

The JTS engines however, they always seem to wear down their cams. They also have a little restrictor in one of the oilways feeding the cylinder head at the top of the block, so as well as the oil being thicker it has to get through a narrower aperture. They probably did this to increase oil pressure at the bottom end to try and prevent them rattling out their big end bearing, but by doing this caused a cam/lifter wear problem. This is my theory anyway.

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So, what oil do you recommend I switch to on my JTS?
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The issue I have with blaming cam wear on using 10W60 is that so many people on here have found their garage has used 10W40 (or worse 5W30) that the cam wear could quite easily be because they DID NOT use 10W60 at some point...
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So, what oil do you recommend I switch to on my JTS?
If I owned one personally I would find use the same stuff I use in my GTA, Fuchs Titan Race Pro S 10W50 ester synthetic oil. If I was a gentle driver I'd use a good quality fully synthetic 10W40 or 5W40, I'm convinced Alfa restricted oil flow to the top end to bump up the bottom end oil pressure and thats why the cams wear, and I'd be more worried about metal particles in the oil than a lower bottom end oil pressure. The cams themselves are barely different to TS cams, and so are the lifters. Twinsparks don't really kill their camshafts like JTS engines do (although its not unheard of), gotta be the oil IMO.
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The issue I have with blaming cam wear on using 10W60 is that so many people on here have found their garage has used 10W40 (or worse 5W30) that the cam wear could quite easily be because they DID NOT use 10W60 at some point...
Kind of makes sense - an oil-thirsty JTS will chew through a thinner weight oil quicker and that really will kill the top end off, and the sort of owner that doesn't check the invoice to see what the dealer put in is probably the same sort of owner that doesn't check the dipstick often enough.
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Non JTS Fiat engines wear cams too. It's not the oil it's the design of the cams/hardening IMO.

The cam is not going to give a dam between 10w40 and 10w60. 10w60 is only used due to heavy oil consumption and possible fuel dilution. Fuel diluted 10w40 (or 10w60) oil maybe an issue, it may get very thin
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