If you own an Audi, VW, or another VAG group vehicle, chances are your service booklet mentions Castrol EDGE Professional LongLife III 5W-30. But when you visit a retailer or shop online, you’ll most likely find Castrol EDGE 5W-30 LL instead. So what’s the difference, and is it safe to use the retail version?
Same OEM Approvals (VW 504.00 / 507.00)
The good news is that both oils carry the same OEM approvals — specifically VW 504.00 / 507.00. According to Castrol’s technical team, the retail EDGE 5W-30 LL is fully miscible with the workshop-supplied Professional LongLife III. In practice, that means topping up with the retail version is completely fine.
Branding & Distribution Differences
The biggest difference lies in branding and distribution: - Professional LongLife III: Supplied mainly through franchised dealerships and workshops, often in bulk. - EDGE 5W-30 LL: Packaged for retail, available in 1L and 4L bottles for consumers.
Some “Professional” oils may include UV markers or dyes for authenticity checks, but the base formulation and performance meet the same VW standards.
Why the Specification Matters
Both products are low-SAPS, fully synthetic oils designed for modern engines with particulate filters. As long as the packaging lists VW 504.00 / 507.00, you’re covered. Be careful not to confuse these with other EDGE 5W-30 variants sold in different markets that may not meet those approvals.
Bottom Line
Top-ups are safe: You can confidently mix EDGE 5W-30 LL with Professional LongLife III.
Check the spec: Always look for VW 504.00 / 507.00 approval on the bottle.
Buy from trusted retailers: To avoid counterfeit or mislabelled oils.
Final Word
When your car manual specifies Castrol EDGE Professional LongLife III, but the shop only stocks EDGE 5W-30 LL, don’t worry. They’re effectively the same oil where it counts — in meeting VW’s strict long-life standards. The “Professional” label is more about supply channels than about what’s inside the bottle. Thankfully ZM Parts stocks both Castrol EDGE Professional LongLife III 5W-30 and Castrol EDGE 5W-30 LL so we have it covered whatever your preference!