Tickford used to recommend Castrol GTX mineral oil

in its original flavour of 20W-50.
The viscosity ratings relate to how runny an oil is when
cold (W = winter) and hot.

  The lower the number, the thinner the oil.


This might be modern Castrol GTX, but
 the viscosity rating is wrong and
it's part-synthetic now


The "20W" means that the oil stays reasonably thick when the engine is cold
and although this isn't so conducive to easy starting, it does protect
your engine if you make lots of journeys where the
engine doesn't get hot.
The "50" means that the oil stays nice and thick to protect the engine and turbo
when you are driving the car hard.
Most multi-grade oils nowadays have much thinner viscosities because
 the tolerances in modern engines are much tighter.
20W-50 is still available, but mainly from the budget makes that you
 wouldn't want to trust in your Tickford.


Some budget 20W-50 oils
are available


Brian recommends the 15W-50 version of Mobil 1 which is no longer
produced, but quantities are still available from places like eBay
 and a few motor factors.
You pay a bit of a premium, but it is good stuff!
Just be careful if you are buying some as there is also a motorcycle
variant of the oil which will have 4T on the label.


Make sure it is the Motorsport Formula and
not the 4T motorcycle oil


When worldwide stocks do run out, Valvoline VR1 20W-50 is a
good quality oil at a reasonable price.


VR-1 is the correct viscosity mineral oil,
so a good alternative


More recently, it appears that the original version of Castrol GTX
20W-50 mineral oil is available, but you'd have to import
it from the USA!


Not sure how easy this would be to import


Oil becomes thinner with age too and Brian always prefers to change it every
3000 miles rather than the 6000 miles shown in the
factory service schedules.