Synthetic oil
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The first piston engine that I ran across where synthetic oil was mandatory was a low/moderate performance 'old school' pushrod V8. No DOHC, no turbo, just a design decision to specify synthetic versus replumbing the engine compartment for an oil cooler.
#23
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Are you replying to me? My point being that the reasons for using synth in certain turbocharged engines apply to some degree IMO, to most modern high-spec engines.
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Oil Specification: API SJ / EC and ACEA A1-98 or A3-98
..together with the usual SAE viscosity/ambient temperature table, with 10W-40 recommended for hot climates and 5W-30 covering most usage.
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#31
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The Brits dont have the Padantic historic folklore about oil changes as the USA ( Yes a 55 straight 6 Stove bolt Chevy may have need an oil change every 2 weeks or 2000 miles ) BUT Modern engines , oils & filters preclude that old notion .
With anycar I have had for the last 10 yrs its been the usual British Interval --every 12 months or 10--12.000 miles .
I just sold a 1.6 THP 140 turbo Peugeot 3O8 ..Recommended oil change 2 years or 20,000 miles . & this engine is more complicated than any Jag engine .
With anycar I have had for the last 10 yrs its been the usual British Interval --every 12 months or 10--12.000 miles .
I just sold a 1.6 THP 140 turbo Peugeot 3O8 ..Recommended oil change 2 years or 20,000 miles . & this engine is more complicated than any Jag engine .
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#33
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One of the corner garages where I used to live tried doing a guilt act on me because I was not doing 3000 KM oil changes on my cars. They suggested that not only do I need to change the oil at that interval but would require a complete engine flush each 6000 KM 'just to be sure'.
I went out of my way to steer business away from them as much as I could.
#34
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Hmm. The Driver's Handbook for the 1999 3.0l does not mention synthetic as opposed to mineral, and has this to say regarding the oil type:
Oil Specification: API SJ / EC and ACEA A1-98 or A3-98
..together with the usual SAE viscosity/ambient temperature table, with 10W-40 recommended for hot climates and 5W-30 covering most usage.
Oil Specification: API SJ / EC and ACEA A1-98 or A3-98
..together with the usual SAE viscosity/ambient temperature table, with 10W-40 recommended for hot climates and 5W-30 covering most usage.
#35
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I'm quite satisfied with Shell Rotella 15W40 conventional heavy duty oil which meets API SJ along with its diesel ratings. The 10 quart jug is just right for a complete change and available at heavily discounted prices.
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Is SM backwards compatible with SJ and SL? The API says yes, yet it is know that the reduced concentrations of zinc and phosphous can be detrimental to flat tappet camshaft engines (not a concern on our S-types)
Just adds another layer of complexity to the subject.
#37
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There are certainly vehicles, both diesel and petrol that do require use of synthetics for good reason. I wouldn't second guess the OEM and substitute dino on any of those. The requirement most frequently is to do with heat soak-back after hot shutdown and an issue with dino oil coking in oil passages or galleries. Turbo units frequently have this issue.
So, Jag says that a supercharged STR does not suffer from oil coking or heat soak-back problems after a hot shutdown. Even if they are 99% correct, the increased oil-change intervals and more stable viscosity makes me prefer to use synth oil. Am I wasting my money?
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An extended oil change interval might help save money or avoid waste- but what interval have you chosen and how did you determine that it might be appropriate? Jag gives no credit for those using synthetic vs. dino.
Given your ongoing admonishments to those that discuss deviating from Jag's octane requirements, reading your comments above is a surprise.
#39
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Even if a person were to read and memorize the entire spec-it helps little when choosing an oil for purchase only to find that the spec is out of date and the product is no longer being manufactured. Later owner's manuals reflect the discontinuation of API SJ oil and recommend API SL instead. The SJ spec in turn is also out of date having been replaced by API SM.
Is SM backwards compatible with SJ and SL? [The API says yes, yet it is know that the reduced concentrations of zinc and phosphous can be detrimental to flat tappet camshaft engines (not a concern on our S-types)
Just adds another layer of complexity to the subject.
Is SM backwards compatible with SJ and SL? [The API says yes, yet it is know that the reduced concentrations of zinc and phosphous can be detrimental to flat tappet camshaft engines (not a concern on our S-types)
Just adds another layer of complexity to the subject.
API SJ/SL are still currently available, notably in heavy duty conventional oils such as the above mentioned Shell Rotella, Valvoline Blue, Mobil Delo and Castrol.
There is nothing complicated about the Jaguar specification at all. It is one line referring to an industry specification. What adds complication is people swanning about insisting that their opinion couched as pseudo-science is somehow more relevant, exacting and learned than the specification and the mandated laboratory testing.
Since you have not bothered to point it out, any oil rated at greater than W30 has relaxed limits for ZDP. That includes W40. So for those insisting on thin winter weight, the vendor data sheets to look at would be the 5W40 heavy duty oils like the Shell Rotella 5W40 synthetic.
Finally, if someone needs to ask what oil to use, then they are not qualified to deviate from the specification found in the owners manual. Following the specification is perfectly safe. Listening to the advice found on the internet without critical evaluation is not perfectly safe.
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