- Jan 21, 2018
- Calgary, Canada
Thanks to the respondents to my other thread for recommendations on a motor oil for my 2013 GTI. In this thread I’d like to ask about the primary factors that I should consider when selecting motor oil in the future. I assume the most important factor would be ensuring that the oil meets the OEM specification (VW 502.00 or 503.00 or 504.00). But what are the other important factors to consider - such as other OEM specs that are listed on the bottle, or specific physical properties of the oil? For example here are some other manufacturer specs I've seen mentioned: Porsche A40 MB 229.5 BMW LL-01 And here are some physical properties I've seen mentioned: NOACK volatility (lower is better) HT/HS viscosity (higher is better) Sulfated Ash content (lower is better) Mini-Rotary Viscometer at low temp (lower is better) Are there other important physical properties or OEM specification to consider, and how would you rank them in order of importance?