Motor Oils - viscosity, and other qualities?

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Quoting manufacturer derived figures is as accurate as Stevie Wonder visually counting books on a shelf.

Sitting behind a lorry at 56mph might get you some higher figures, you won't constantly smash the manufacturer ex-urban figure

 

[moon man]

Guess it's location and typical commute also ,in my case it's a 30 min commute to Padstow ,50 mph road followed by 60 mph ,gentle gradients ,mixed driving would send me to mid 50s for sure

 

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Guess it's location and typical commute also ,in my case it's a 30 min commute to Padstow ,50 mph road followed by 60 mph ,gentle gradients ,mixed driving would send me to mid 50s for sure

Yeah totally. Not so great in the winter months.

I can eek 38-40MPG from the X5 on a motorway with light traffic and using some proper eco techniques. The Insight is always averaging 60-70, but can hit 100+ if you're prepared to draft a lorry. Finding a coach moving at around 70mph is even better as you make normal progress with aero efficiency to the max.

Anyway, back to the OP, use the recommended oil grade and buy the cheapest one from ECP/CP4L using a discount code or from eBay and just do regular maintenance checks and drive. Tyre pressures will have more effect than any fancy 'marketing pushed' oil, so if you're going on a longer journey, just pump up pressures 5psi higher than normal and try some hyper miling techniques.

 

[Simon]

What spec does your car ask for. The 0W-50 has no ACEA credentials for a start.

 

[4K8KW10]

ACEA A5 gives high fuel consumption reduction, ACEA C1 oils are the best for keeping the engines clean and with lowest fuel consumption.
https://www.oilspecifications.org/acea.php

 

[4K8KW10]

Probably the best one before going to 0W-20 oils

https://products.liqui-moly.com/top-tec-4500-5w-30-1.html
LIQUI MOLY ТОР ТЕС 4500 5W-30