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[aaronjb]

Retail is £31+VAT for 5L, trade club is £12.75+VAT for 5l, usually buy 3 get one free as TB says - for the semi syn. Fully syn is only slightly more.

That's madness, nearly £20 different!

Over £20 once you add the VAT, and no 4-for-3 offer on regular retail, so you'd be paying £148 for 20L instead of £46..

[05omegav6]

GM Semi Synth, esp if you have access to Trade Club, as it works out about £45 for 4 x 5l cans. Filter about £5 on Trade Club.

Any Semi should do, but Castrol GTX and Magnatec are known to be problematic, so best avoided.

OMG I've never paid more than £3 for a filter, 20 ltrs GM semi synth £36. No trade card needed if you've access to a decent parts desk/ Andy C well worth looking up too

[maracus]

Retail is £31+VAT for 5L, trade club is £12.75+VAT for 5l, usually buy 3 get one free as TB says - for the semi syn. Fully syn is only slightly more.

Is there any advantage of fully synthetic over semi? Is it worth paying the extra?

Or is it simply down to the grade wether it's fully/semi?

[YZ250]

you dont say which engine you have fitted but i can only speak from oil changes on my v6.
drain plug is located on base of sump,(usually a torque type plug) if you have an internal paper oil filter as opposed to a canister type one, then a socket drive handle will suffice.
as for oil gm 10/40 semi synthetic.   5.75 ltrs of oil.  hth 

With a socket on the end I hope.    Some members have had bad experiences using the square hole instead of the intended hex on the end cap.