My hybrid love it, even though i went a bit too thick should have went with 10w-30 or 10w40. I'm not sure if Toyota dealer even change my oil as every morning during cold start every time i put it in to gear I have that horrible scary click, now it is out of warranty, so the oil change myself, no more click during cold start and the engine runs quiter, when it needs to run cuz you know.... Hybrid

since buying my beautiful landcruiser 2nd hand 165000klms was not sure what oil to use so did a search on your penrite search page and came up with this product. it uses no oil whatsoever and at 5000klms oil still looks brand new dont know what magic you guys are into but it appears that your product is the pinnacle of oil technology. no other product shall go near my baby cruiser ever again even runs cooler as well, you n guys know ur stuff thank you for looking after my vehicle. should reach 500,000 klms without an issue. take care!

Before using this oil I used Royalpurple's HPS.
Royalpurple was a good oil, but oil leakage occurred.
In addition to the property that the engine of my car originally leaks easily, Royalpurple may be caused by PAO base oil.
After exchanging with Penrite HPR, the oil leak has stopped.
Penrite not only seems to have protected the engine by checking whether the oil film is strong, it seems that rise in oil temperature is suppressed as well.
The engine feeling also became smooth and torqueful, so I am really satisfied with changing the oil.
Afterwards it is best if this feeling continues to about 5000 km.
If so, I will also make the next oil change HPR.

BA XR8 Manual. Bought the car at 163000kms, it's now at 570000kms. Since I bought it I've always used HPR 10, changing oil at every 15000kms. The car travels from central Vic to Melbourne (Docklands) & back every day & is definitely NOT babied. This engine is still dead smooth & dead quiet, Still pulls strong to red line when asked to, blows no smoke & doesn't need any oil top up between changes - Each 15000kms uses roughly 5-600mls. Most reliable engine I've ever owned & I'm sure that's largely due to the Penrite HPR 10. Love this oil!

Penrite recommended this oil as their preferred in my 1992 Mercedes 300ce AMG. I transitioned from mineral to semi-synthetic to full synthetic over the past seven years with no noise at all from the valve train and smooth idling. Within 100km of using the Penrite 10w-40w (extra 10) the engines lifters now chatter for what was at first maybe 5 seconds and now maybe 10 seconds, within the first 30k the engine has begun to idle roughly as if out of tune (It is not) I am very frustrated to have been recommended $68 worth of oil only to have to dump it, but I have no other choice. I have used Penrite premium mineral and semi in the past but would advise against their 'new' Extra 10 range and any of their synthetics for your pre 2000 vehicles.

I drive a calais it is the vs 3.8 series 2 and is supercharged factory, L67 motor so similar to many commodores. I have always used synthetic and found this oil was better than most but I would say the Valvalin synthetic was slightly better, and ran a little smother and quite, but this oil seems to have protected my car through high temperatures and Ive been happy. Im going to try the gulf western semi synthetic and if its no good ill go back to penrite or valvoline. It would be good if the guide reccomended if you need a different grade for supercharged cars with high kms. 15-50 is the grad i was using, trying 10w 40 next with GW. Ps I only keep my oil for 5000 -8000 kms and then I change it and my oil usualy stays reatively muck free.

Some years ago used HPR 10W50 in my Hyundai Excel and lasted well over 10.000 kms, the condition of the oil was still good. Could've done another 5.000 kms easy. If your engine is in well maintained condition then the oil will last longer.