No they sell both...
http://www.opieoils.co.uk/p-79207-gulf-formula-gmx-5w-30-fully-synthetic-engine-oil.aspx
http://www.opieoils.co.uk/p-60131-gulf-f...w-mercedes.aspx
(I don't work for them, in case you're wondering).
I've used Gulf's "Formula G" 5W-40 before. Seemed like I was buying a budget oil, but only because of the cheap(ish) price. I can buy oils from their service stations here in the UK (of which there aren't that many) or from Opie Oils at good prices.
Here's a link to a PDF...
Originally Posted By: bbhero
This here is one of the best rationales of how to proceed when buying oil for a car. Read what meets the specifications of the manufactors and choose from there. The MB 229.5 is one of the hardest specs to meet.
That's good advice. My Honda manual states "use any...
I changed my oil last weekend (Shell Ultra)... This weekend, I hydrolocked my engine - sorted it all out and oil was changed due to water contamination.
If I leave the week old drained oil in a container long enough for the water to separate - would it be safe to re-use for my next oil change?