engine oil

[Jonny blue jeans]

What is best engine oil for my Stag and can I use synthetic oil? Thanks in Advance

[jbuckl]

20/50 high zinc.

https://www.ebay.co.uk/itm/114768808768?campid=5338627314&mkevt=1&mkcid=1&toolid=10050&customid=EAIaIQobChMIkfn9jc2W-gIV1u3tCh2xxw6bEAQYASABEgIqS_D_BwE&mkrid=710-53481-19255-0&customid=EAIaIQobChMIkfn9jc2W-gIV1u3tCh2xxw6bEAQYASABEgIqS_D_BwE&gbraid=0AAAAADk7gXM7q-SgGalI8jscQ2--FO8dl&gclid=EAIaIQobChMIkfn9jc2W-gIV1u3tCh2xxw6bEAQYASABEgIqS_D_BwE

[wilf]

Or Millers do a range of oils suitable for classic cars, but yes, ensure what you use has the ZDDP (zinc) additive. Which will not be present in oils for moderns as it "poisons" catalysts.

[Goldstar]

20/50 high zinc.
https://www.ebay.co.uk/itm/114768808...SABEgIqS_D_BwE

According to the ROM, engine oil needs to meet API SE, JB. This one is only SD (although I don't know what the difference is technically). I use these guys for my RR oil and they are excellent. Been around since 1925 and were Shell blenders from the beginning of time. 20L is £61.66 inc VAT and from memory, delivery is about £9. I just called them to check the ZDDP levels and they say it varies by batch but is minimum 1200ppm and max 1300ppm. I'll be giving it a go as the RR stuff was excellent at £80 for 20L (bloody thing takes 9L per oil change!!).

https://www.smithandallan.com/produc...xl-20w-50-4165

[marshman]

Good eyesight !!!


API SD : Not suitable for use in most gasoline-powered automotive engines built after 1971. Use in more modern engines may cause unsatisfactory performance or equipment harm.

API SE: Not suitable for use in most gasoline-powered automotive engines built after 1979.

https://www.api.org/products-and-services/engine-oil/eolcs-categories-and-classifications/oil-categories#tab-gasoline

SD is probably OK being as the Stag engine was designed in the late 1960's. But I personally use Rye Oils Classic Oil. API grade SF - the higher the letter the better the oil and cheaper at £88 for 25 litres delivered - gone up a lot since last year !!

https://www.ebay.co.uk/itm/272057337351

[jbuckl]

Apologies I should have recommended the smith & allen 20/50 as paul did.

[jbuckl]

According to the ROM, engine oil needs to meet API SE, JB. This one is only SD (although I don't know what the difference is technically). I use these guys for my RR oil and they are excellent. Been around since 1925 and were Shell blenders from the beginning of time. 20L is £61.66 inc VAT and from memory, delivery is about £9. I just called them to check the ZDDP levels and they say it varies by batch but is minimum 1200ppm and max 1300ppm. I'll be giving it a go as the RR stuff was excellent at £80 for 20L (bloody thing takes 9L per oil change!!).

https://www.smithandallan.com/produc...xl-20w-50-4165

My merc takes 8 litres. Cheapest source for the recommended oil was Mercedes Benz at £60 for 20 litres…. Delivered… Who’d ve thunk it?!

[Jonny blue jeans]

Thanks everyone for the advice, all good to know.

[RobinLegin]

Also check the Penrite range. The Shelsey light 20/60w is high zinc content. I use it in the Alvis and it maintains viscosity when really hot.