Haha ADVAN I have ALMOST similar question as well...

What is the difference between LQ TOPTEC 4100 and 4200?

From what I've read on their website, seems like 4100 is only suitable for diesel cars and 4200 is suitable for gasoline and diesel.  Can anyone confirm this?

Oh, ADVAN, you are able to get LQ Synthoil High Tech here?

top tech is NOT fully synthetic:
http://www.liqui-moly.de/liquimoly/produkt...ocument&land=GB

also liqui moly is no longer API certified for a very long time.

here's what i got from their representative

not really.

it's just my personal (read: anal) preference towards people claiming certifications they do not have.

royal purple i have no experience.

SR-1 is highly recommended and it is also API SN certified which i've gone as far as 16k km OCI with very minimal degradation (search for my previous post within this thread btw)

the cleaning agents/properties also not bad as my engine is sparkling clean when i open the top to replace valve/rocker cover gasket and adjusting valve clearance

=edit=
to make it clear and to avoid people using my words against me, i have nothing against LM besides what i've mentioned. and i have personally used their semi synthetic MOS2 and i am STILL using their MOS2 for my sister's kancil and i've used their various products from ceratec to engine flush and they've always worked as advertised so if you're asking me if i would recommend LM or not, i'd most certainly do depending on your budget/requirement.

personally, when it comes to semi synthetics, there's very few who can give the satisfaction for LM's MOS2 price vs performance ratio.
i just moved on to fully synthetic for all my cars except the kancil cuz sister don't want to pay so much for a year 1995 car