mbz

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mbz last won the day on April 21 2019

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About mbz

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  1. Quick follow up on this.... Upon further consideration and research, it seems that the general consensus regarding "safe" levels of ZDDP (zinc & phosphorus) is about 800-900 ppm. Apparently these levels will not reduce the efficacy of the catalytic converter. After speaking with the folks at AMSoil, they confirmed that the Z-Rod ZDDP levels are high enough to reduce the efficacy of the catalytic converter. I explained to them that my 76' 280z needs to be smogged every 2 years. AMSoil recommended their European Formula Improved 5W-40 Synthetic Oil, and said that several guys at AMSoil have old Z cars and use this product in their Z cars. They do not publish their zinc and phosphorus levels on the website, but if you call and ask they will tell you. This product has: Zinc: 887ppm Phosphorus: 788ppm https://www.amsoil.com/shop/by-product/motor-oil/european/european-car-formula-5w-40-synthetic-motor-oil/?code=AFLQT-EA I ordered a case and a couple of their filters too. We'll see how it performs.
  2. I’m thinking that Amsoil, Royal Purple, Mobil, Penzoil, Castrol, etc. have figured out the proper ZDDP formulation by now so that it does little if any damage to the cats when used as intended without other oils or additives. In 2 different vehicles I’ve been using Mobil 1 (14 year old car) and Castrol Edge (19 year old car) exclusively for the life of the vehicles. Both products have ZDDP formulas added to the oil, neither vehicle has ever failed emissions and have never had to replace Cats on either vehicle. “WHEN USED AS INTENDED WITHOUT OTHER OILS OR ADDITIVES” being the critical point here.... Sent from my iPhone using Tapatalk
  3. We have to have some fun to offset the high cost of living, excessive taxes, oppressive smog laws, etc. etc. [emoji23] Sent from my iPhone using Tapatalk
  4. Yeah, I kind of figure that since the Royal Purple that the PO has been using for years probably has already affected the Cat. That said, it costs less to replace the Cat than the engine, so I’m going to protect the engine. Sent from my iPhone using Tapatalk
  5. BTW.... had a really nice drive in the Z through Decker Canyon this morning. Decker Canyon Road Anyone familiar with the area knows that drive, and if you haven't driven it, you can take the 23 South from the 101 all the way to PCH.... LOTS OF TIGHT WINDING ROADS AND HAIRPIN SWITCHBACKS.😎
  6. So after a little more reading about ZDDP and zinc additive and Royal Purple HPS 20/50 (which has been used in the engine for ???? years), it turns out that stuff has the ZDDP zinc additive as well. Point being, if my cat converter is going to be affected by the phosphors and zinc, it probably has already happened. That said, it also appears that oil manufacturers are well aware of excessive phosphors due to evaporation affecting cat converters, and have adjusted ZDDP additive levels accordingly so as not to affect the cat....... so they say. At this point I think it's safe to assume that if there were any damage to the cat form the Royal Purple it's already been done, so switching to Amsoil won't make a difference in regards to potential Cat damage. Further, it looks like the 20/50 Amsoil standard and the Amsoil Z-Rod BOTH have ZDDP so..... you're getting it whether you like it or not. I think the real question now is this; Does the benefit of protecting the engine with the ZDDP exceed the downside of possibly affecting the Cat performance? Oddly, it appears that if you add a third party ZDDP additive product to a motor oil that already has a ZDDP formula, it increases the amount of zinc and phosphors, but reduces the efficacy of the product. This may be where people are causing damage to their Cats, by adding more ZDDP to a balanced formula, it results in excess phosphors that damage the cat. Anyone have some insights/experience with this?
  7. Yeah, I’m about 30 mins south of you, so we have the same draconian California overlords telling us how to live our lives. [emoji23] Sent from my iPhone using Tapatalk
  8. Granny, as a distributor, do you have any info from Amsoil regarding the zinc affecting the cat converter? Sent from my iPhone using Tapatalk
  9. I do have a cat and the car requires smog check every 2 years. So maybe best to skip the zinc additives? Sent from my iPhone using Tapatalk
  10. See the boobs thread for a natural remedy. [emoji1787] Sent from my iPhone using Tapatalk
  11. Thanks Dave. Yes it never gets below 45F here but can get up to 120F. So I’ll stick with the20/50 then. Sent from my iPhone using Tapatalk
  12. 76’ 280z California version (manf. 9/75) I’m planning on doing my first oil change since purchasing the car about a year ago. PO’s mech used Royal Purple oil (20w50 HPS) and RP filter. It has been running fine, no leaks. There’s really no complaints, just looking to treat this old engine better if possible. After doing some research on the interwebs, I’m thinking about switching to Amsoil with zinc additive. But as usual when overthinking something simple, it leads to more questions. Anyone using this stuff? Is the zinc additive a good idea? Or should I avoid it and why? Recommendations on viscosity (the 20w50 that PO used seems a bit thick...)? Recommendations on oil filter? (OE or 3rd party.... does it really matter & why). Looking to set a game plan to stick with for several years as I like to buy in bulk and save. TIYA for inputs. Sent from my iPhone using Tapatalk
  13. Good points, but I'm trying to stay as conservative as possible on the actual resale value. I think $25k is pretty reasonable and a very attractive price point. But like I said, I told the seller my buying price, if he wants to sell it to me he knows where I am. If he wants to sell to someone else and get more money, good for him I applaud his efforts.
  14. Yes, I see comparable vehicles in respectable condition selling for about $25k on the high end. Considering the frame rail and floor pan work, the paint prep and paint job work, plus other mechanical and interior work, it would put me right about at that $25k range. Which means I would have to put in quite a bit of time and money without any significant margin potential when finished. I told the seller at what price I’m a buyer and to call me if he ever decides to sell at my offer price. As it stands right now, he’s about double my offer price.