I've just bought a 90's spec (G plate) XR3i.

The guy who I bought it off claims he did a full service himself but had no receipts to warrant this, the oil on the dipstick looks clean so I'm thinking he's topped it up at the least.

Would ideally like to change the oil and filter now incase he's used some cheap nasty stuff.

What grade of engine oil should I use and are all oils similar in terms of brand?

I read somewhere that it should be 5/40, I was going to buy castrol.

Thanks.

 

GSF has Fuchs 5/40 fully synthetic for Ł16.50 +VAT for 4 litres, or 10/40 semi for Ł13.50 +VAT.

 

I would have said a 5 or 10W40 weight oil, I would also say unless you know 100% for certain it has been done change the timing belt as well.
tabetha

 

to be honest mate sum of these fully syn oils wernt about when your xr3i was-so any 10w40 15w40 will be fine,they state 5w30 on rs turbos which is way to pissy thin! so i ran 10w50 with 243bhp