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Royal Purple Max-Clean Fuel System Cleaner and Stabilizer 11722 20 Ounce
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From Royal Purple
This report was last updated 10/11/2023.
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Report Info:
Note: We only analyze "reviews" and ignore one-tap "ratings".
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Report Card
Warn Overall Grade
FAIL Deleted Reviews
FAIL Suspicious Reviewers
WARN Rating Trend
WARN Phrase Repetition
PASS Unverified Purchases
PASS Word Count Comparison
PASS Overlapping Review History
PASS Reviewer Ease
PASS Brand Repeats
PASS Incentivized Reviews
N/A Reviewer Participation
Most Trusted Reviews
I have used lots of different fuel injector cleaners of ... [Go to full review]
Nov 19, 2022
100%
TRUST
TRUST
- Verified Purchaser
- Easy Grader (avg. rating: 4.7)
Least Trusted Reviews
Nothing compares to this. Don't go cheap for zero results. ... [Go to full review]
Jul 15, 2023
0%
TRUST
TRUST
- Verified Purchaser
- Created on a high volume day
- Contains repetitive phrases (show)
- Take-Back Reviewer (1 deleted Review; avg. rating: 5.0)
- Overlapping Review History: reviewed 4 of 9 top products
- Easy Grader (avg. rating: 5.0)
Analysis Details
Fail Deleted Reviews
We discovered a total of 51 deleted Reviews for this product, with an average rating of 4.8. Even though deleted reviews don't affect the average rating, the fact that action was taken to delete reviews raises some red flags about the integrity of the reviews for the product as whole.
There are a few limitations to keep in mind regarding the Deleted Reviews test:
- We don't have a magic ability to collect every single deleted review; we can only identify reviews as deleted if we collect them on one date and then notice they are no longer visible on a subsequent date.
- We have no information on reviews that were never published in the first place.
- We also don't know why these reviews were removed. It could be action from the platform, personal decision by the review author, part of an entire account closure, even some data error on our part, etc.
Fail Suspicious Reviewers
Take-Back Reviewers
Approximately 40% of reviewers have had at least one of their past reviews for another product deleted. The Take-Back Reviewers have rated this product an average of 4.8 while the reviewers who don't have any deleted reviews in their history have rated this product an average of 4.1. Based on our statistical modeling, the discrepancy in average rating between these two groups is significant enough to believe that the difference is not due to random chance, and may indicate that there are unnatural reviews.
Warn Rating Trend
It appears that several reviews were created during just a short period of time.
Read more about our Rating Trend test.
Read more about our Rating Trend test.
Warn Phrase Repetition
Reviews that contain one of these phrases are NOT necessarily devalued; read more about how this test works here.
Common Phrases in Reviews:
~8% of reviews
(4.5/5)
(4.5/5)
Approximately 80% of reviews use substantial repetitive phrases between them. This is an excessively large percentage which may indicate unnatural reviews.
Pass Unverified Purchases
72 of the 2,243 total reviews for this product are unverified purchases. This is within an acceptable range and it does not appear to be significantly affecting the overall rating for this product.
Unverified purchases may be the result of Kindle Unlimited readers, buyers who didn't pay full price, or reviewers who did not purchase the product at Amazon. Read more about our Unverified Purchases test.
Pass Word Count Comparison
-
- <10%
- Have an overrepresented word count
We didn't find any review word count groups that had a statistically significant greater concentration than what we'd expect to see in this category.
Read more about our Word Count Comparison test.
Read more about our Word Count Comparison test.
Pass Overlapping Review History
Reviewers of this product have ALSO reviewed the following products:
<10% also reviewed:
Dr. Elsey's Precious Cat Ultra Cat... by Dr. Elsey's
<10% also reviewed:
Dogbed4less Jumbo Orthopedic Memory Foam Dog Bed... by Dogbed4less
<10% also reviewed:
Ecover Automatic Dishwasher Soap Tablets, Citrus,... by Method
<10% also reviewed:
KONG EZ Soft E-Collar for Cats and Dogs by KONG
<10% also reviewed:
Zion Judaica Quality Tealight Candles 4 - 4.5... by Zion Judaica Ltd
<10% also reviewed:
Dogbed4less Durable Olive Green Canvas Pet Bed... by Dogbed4less
<10% also reviewed:
Amazon Brand - Solimo Dark Roast Coffee Pods,... by Solimo
Does not include products
from the same brand
from the same brand
Approximately 25% of reviewers have substantial overlapping product review history. This is within an acceptable range and it does not appear to be significantly affecting the overall rating for this product.
Pass Reviewer Ease
The ease score is the average rating for all reviews that a given reviewer submits. The average ease score for reviewers of this product is 4.2, while the average ease score for reviewers in this category is 4.3.
4.2 Product's Average Ease Score
4.3 Category's Average Ease Score
Read more about our Reviewer Ease test.
Pass Brand Repeats
Brand Repeaters
Less than approximately 10% of reviewers have reviewed other products for this brand. This is within an acceptable range and it does not appear to be significantly affecting the overall rating for this product.
Pass Incentivized Reviews
On Oct 3, 2016, Amazon prohibited incentivized reviews, however we still test for them since there are still millions in our dataset.
-
- <10%
- Admitted to receiving an incentive
We didn't detect any reviews that used language indicating they were incentivized.
Read more about our Incentivized Reviews test. Check out our study showing that Incentivized Reviewers are much more likely to leave a positive review.
Read more about our Incentivized Reviews test. Check out our study showing that Incentivized Reviewers are much more likely to leave a positive review.