LM HC7 5W40 any good?

[kilou]

Hi,

the HC7 oil is a hydrocracked oil (groupIII???) in 5W40 flavour. I'm looking for a good oil in my high mileage 200K miles Volvo engine (non turbo) for Switzerland so I've been recommended to go with 5W oils (currently running Mobil Super S 10W40 with some tappet noise in winter when cold).

The Liqui-Moly HC7 5W40 tech sheet is here:
http://www.liqui-moly.de/liquimoly/mediendb.nsf/gfx2/1346%20Leichtlauf%20HC%207%20SAE%205W-40_EN.pdf/$file/1346%20Leichtlauf%20HC%207%20SAE%205W-40_EN.pdf

Is a hydrocracked oil easier on seals (detergency) in high mileage engines compared to full synthetic oils such as Mobil 1 5W40 (not Delvac)? Do you think the HC7 oil is appropriate for 15'000km (9000miles) OCI in my normally aspirated 2.0L Volvo engine?

Thanks

 

[d00df00d]

Originally Posted By: kilou
Is a hydrocracked oil easier on seals (detergency) in high mileage engines compared to full synthetic oils such as Mobil 1 5W40 (not Delvac)?

It's difficult to say when you're comparing fully formulated oils. However, I believe Group III base stocks are typically easier on seals than Group IV or V base stocks. Open to correction if I am wrong.


Originally Posted By: kilou
Do you think the HC7 oil is appropriate for 15'000km (9000miles) OCI in my normally aspirated 2.0L Volvo engine?

There's only one way to find out.

I'd say it's a safe bet. Most modern Group III based oils are very, very good.

 

[kilou]

Thanks for the input! Sounds like a good oil indeed. Moreover the nice thing about it being a groupIII would make it compatible with AutoRX. I'm currently on the clean phase with some cheap conventional 10w40 but since many poeple recommend running the rinse phase for much longer than instructed with AutoRX for low sludge applications, like rinsing for 6000 miles, I wonder if I can already use it for my next oil change to get 5w40 into the engine for the winter.

I know it's ok to use ARX with groupIII oils but I have no idea if that groupIII HC7 5W40 does also contain some groupIV or V basestocks. If it does, then I guess it's not a good candidate for a rinse phase of 6000 miles.