Very capable oil for LR4 V-8
354117
Works great in 2013 Land Rover LR4 Jag V-8! Sick of paying high dealer prices. Tough oil for OTC!
3480789
Great oil. I switch to this from chevron oil. Its cheaper to buy it in bulk than going to AutoZone.
201772
Use this oil in my Polaris 900 trail.  Works great.  Best price for high quality oil.
4473496
The 1/gal size is obviously the better buy, but if you only need 4.5 quarts and can't spend the extra amount right now then this is perfect.

Here's my review for the 1/gal size;

 I started using this in my 2013 Golf MkVI 2.0l TDI DSG (CJAA) at 40K miles even though it is NOT a VW 507.00 approved oil. I would have switched to it right away at the first OCI but the dealer supplied OE oil (Castrol Professional LL03 5W30) was FOC with factory warrantied maintenance. I'm not worried that it's not an "approved" oil as RLI has plenty of positive results/use in all types of vehicles, including the Audi RS4, although I would have used it regardless. I've only been using it for approx. 2K miles now but I noticed a definite improvement with how smooth the engine is running, performing, as well as MPG, compared to the OE oil. Only time/mileage will tell though... but I have a feeling (like I did when I switched to Motul) that it'll turn out to be a high performance/quality oil and keep the TDI engine running at its best for 100's of thousands of miles. Only regret is not taking a sample of the used OE oil for UOA ("Used Oil Analysis") to compare against Bio-SynXtra after 10K miles. I've done UOA in the past but they've become so expensive, plus others have done it already (RS4). I was actually sold on this oil a while back and was planning to use the regular formula in my 2003 A4 until I got the TDI.

A bit of history; I've owned four VW/Audi vehicles since 1985 w/ over 500K combined miles. Most of those miles were with extended OCI ("oil change intervals") of 10-15K miles. I even used Canton-Mecca filters for a while with two of them, including other engine/ exhaust/suspension modifications. So the oils have been put to the test. I had also used some non-approved full-synth oils early on (i.e, Red Line,..etc) but since 2004 I used Motul exclusively for engine, transmission, coolant and brakes. So why switch now to RLI? It's Bio-based! One less petroleum product. Plus it's 5w40 (all VW507.00 oils are 5w30), which I have found to be better suited for the 4-cyclinder turbo engine in the SoCal climate.
2551844
Pros: Good protection!

Cons: ???

Use this oil for a 2001 Yamaha V-star and have loved it the past two years. Oil performs well, lasts well (slow break-down), and does everything else the manufacturer claims.

I will continue using this oil for my motorcycle unless something even better, and at the same price, comes on the market.
4585507
Run it in my Porsche 928 S4 with every oil change.  Very important to keep those ZDDP levels up in pre-OBDII cars.  No cat failures by the way after several years of use.
1255674
Has been a very good oil in my Boss 302.  Specialty oils are hard to find and expensive too boot.  This is affordable and with shipping included easy to get.
4302501
Excellent oil. Im very happy with this purchase.
1071554
Best price ever for semi-synthetic that meets specs for late model Ford engines. Enough to change oil twice in both cars. I've read everything I could find on this oil--no bad reviews. A few very small blackish specs were in the bottom of the pail after draining oil into new gallon jugs. Set some out for testing at work, it's some of the moly additive that dropped from suspension. Lightly shake pail before using. I've noticed the same thing in other brands of oil before.
168487
No better oil for any non-special purpose standard vehicle. Heck, even if you have a mid-range extreme competition vehicle, you would be wise to not jusr consider, but, use it.
3366213
Good lightweight oil for lubricating a compressor that uses pads to lubricate a piston.
3691870
Great light oil for bike and other mechanicals. Fairly expensive.
2024750
This is GREAT STUFF!  It makes you oil sorta tacky where it sticks to all the vital parts. I put a quart in my 1986 F-150 with 302v8 along with 5 quarts of full synthetic Valvoline oil. I had a valve cover off replacing a gasket while the engine was running,  only 63k original miles. I turned the engine off and watched all the new oil drain back down into the engine leaving no oil where there just was.  Anyway I added a quart of this Lucas Oil stabilizer and started the engine again. Instead of draining off a quart of my new synthetic oil I just added the whole bottle of Lucas making it 6 quarts in my motor. I've heard mechanics say its not good to run to much oil. And their probably right, but one extra quart ain't hurting anything. Anyway after letting the engine run for approx 15 min with the Lucas installed. I shut off the engine and wanted to see if this stuff worked like I had heard. Well it did! Most of the oil drained back into the engine but alot of the Lucas stayed behind and left a sticky/tacky film that is ultra slick and when you start your engine cold the Lucas is already coated all the major parts like bearings, rocker arms, lifters and camshaft. This product is definitely worth the cost!
3715938
Good oil, has great viscosity and circulates well in the crankcase and reduces wear on all internal moving parts. Maintains great oil pressure and is superior to conventional oil. I started using this when I reached about 50 thousand miles on my vehicle and will continue to use it for the life on the vehicle. Recommend by my GM mechanic and parts specialist.
1983516
Been using this oil in a Can Am Spyder 991 Rotax twin with the SE auto shift. I would not have believed the difference in running quality if somebody would have told me ahead of time. It flat out runs smoother and shifts incredibly quiet and smoothly (especially at higher rpms). Never would I believe an oil would make this kind of difference. This is a TRUE synthetic, not a "fake" full synthetic, but you get what you pay for here. I had been using the OEM semi-synthetic for 30,000 miles, never again.
3115808
I need this oil for it's ZDDP (zinc) additive for the flat tappets in my 1969 RS SS Camaro, 427 big block.  Amazon is one of the very few places I can still find it.  The 20W-50 also helps with the high temperatures this engine develops.  Great oil.
769804
This oil has been in my 5 sd for three years now.  So far it was performed well.  I followed the change interval in haynes manual but the owners manual says the fluid did not require change.  I drained what appeared to be a high quality oil, but the drain pan was dusty and i couldn't reuse.  This replacement oil is just as good, even in cold weather.