Hi Larry, thank you ++. Just ordered the HR5 10w40 conventional. Basically same as HR2 but with some additional additives more specific to classic (anti rust....).
Will also use their fuel and coolant additives. Not the cheapest, except on the long term. So glad to know I no longer have to spend any energy in that department.
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Here is the answer I received from Driven (and the photo of his Wildcat). IMUO they check all the boxes.
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Summary:
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Oil: Starts with HR5 10w40 for its detergents and engine protection, then after you change your seals (older seals don’t do well with thinner synthetic oil) and achieve low psi, switch to GP1 if you push engine / higher temp than 160F
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Fuel additive: Driven Defender + Boost increases octane but also has detergent for cleaning the fuel system and a corrosion protection additive to help with fuels containing ethanol during storage. But not magic: don’t buy shitty gas.
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Hello Chris! Thanks for the Inquiry!
The difference between Driven HR(Conventional) and GP-1 are as follows:
HR oils have a higher level of rust, corrosion protection. This is good for those who drive their cars and store them for periods, typically basing their oil changes on the seasonal calendar vs. actual miles driven.
GP-1 is a great oil for racing, but it is also great for Hot Rod type applications. Our GP-1 oils are not formulated with the additional storage additives. However, GP-1 has a unique base oil that provides natural high load (film strength) so it offers some additional wear protection from a base oil perspective – I will talk about wear protection from ZDDP/additives separate.
I explain it this way - If you store your vehicles for longer periods (winter for example) – go with the HR.
If you drive your Buick consistently (year-round) and change your oil around 3,000 miles or If you have a modified engine (Weekend Drag Racing – Heavier valvetrain pressures – Maybe a supercharger) You should consider GP-1 and the film strength benefit.
The oil you reference has a good value for ZDDP. ZDDP is the zinc/phos anti-wear additive and the value should be 1200 to 1500 PPM. This is enough protection for cams in engines that have been broken-in (including solid lifter). Both the GP-1 and HR oils are in this range, so you are covered. Too much ZDDP may actually can cause wear problems so stay in this typical range and you will be fine. We use moly in our packages to work with the ZDDP to create a high level of wear protection from these friction modifiers. This is a true balancing act that we have perfected over the years.
The only time you need more ZDDP is when you are breaking in a new engine. Our BR series engines have high levels of ZDDP for new engines for 400 initial miles. This is just for a point of reference.
Viscosity is dependent on oil bearing clearance. I had a 425 Nailhead in an Electra 225 a few years ago and ran 10W40 as she had more miles that I could count. (See Photo - Longest car I ever had!) I believe 10W30 was typical. I would mention that HR oils have a benefit of more detergency. This proves to be helpful if you come across am original engine that has many miles but still runs fine like my 425. I wanted to clean up the years of varnish etc. so I ran HR to help clean it out.
Yes, our Defender + boost is a fuel additive that will increase octane. It also has detergent for cleaning the fuel system and a corrosion additive to help with fuels containing ethanol during storage. While I strongly believe in the benefit of fuel additives, I caution users to remember their performance benefit for octane increase is fuel dependent. In other words, in some fuels octane improvers are limited by the base fuel quality. Also, I have never been a fan of the term Lead Substitute. We can increase octane with other materials than lead, but the lubricity benefits of lead in fuels for valve seats in my opinion is difficult to totally substitute. I believe the best route is hardened valve seats - There is a lubricity benefit to Defender + Boost and it’s a great all-around fuel additive because it's addressing multiple potential issues.
Thanks once again for supporting us! I am always here to answer questions. Being the Pontiac/Olds person here it's good to talk to a fellow BOP enthusiast!
Bill Alexander (CLS) (OMA)
Driven Racing Oil
Office: 704-946-9252
3416 Democrat Rd.
Memphis, TN 38118
www.DrivenRacingOil.Com